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layout: Place inline absolute hypothetical boxes properly during block
fragment position assignment. Improves Rust documentation. Closes #13471.
This commit is contained in:
Patrick Walton
parent
19a5a30113
commit
5232b0c85f
38 changed files with 231 additions and 156 deletions
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@ -2044,7 +2044,7 @@ impl Fragment {
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/// Calculates block-size above baseline, depth below baseline, and ascent for this fragment
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/// when used in an inline formatting context. See CSS 2.1 § 10.8.1.
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pub fn inline_metrics(&self, layout_context: &LayoutContext) -> InlineMetrics {
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match self.specific {
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return match self.specific {
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SpecificFragmentInfo::Image(ref image_fragment_info) => {
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let computed_block_size = image_fragment_info.replaced_image_fragment_info
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.computed_block_size();
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@ -2082,30 +2082,13 @@ impl Fragment {
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}
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}
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SpecificFragmentInfo::InlineBlock(ref info) => {
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// See CSS 2.1 § 10.8.1.
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let flow = &info.flow_ref;
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let block_flow = flow.as_block();
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let is_auto = self.style.get_position().height == LengthOrPercentageOrAuto::Auto;
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let baseline_offset = match flow.baseline_offset_of_last_line_box_in_flow() {
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Some(baseline_offset) if is_auto => baseline_offset,
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_ => block_flow.fragment.border_box.size.block,
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};
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let start_margin = block_flow.fragment.margin.block_start;
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let end_margin = block_flow.fragment.margin.block_end;
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let depth_below_baseline = flow::base(&**flow).position.size.block -
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baseline_offset + end_margin;
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InlineMetrics::new(baseline_offset + start_margin,
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depth_below_baseline,
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baseline_offset)
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inline_metrics_of_block(&info.flow_ref, &*self.style)
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}
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SpecificFragmentInfo::InlineAbsoluteHypothetical(ref info) => {
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inline_metrics_of_block(&info.flow_ref, &*self.style)
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}
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
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SpecificFragmentInfo::InlineAbsolute(_) => {
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// Hypothetical boxes take up no space.
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InlineMetrics {
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block_size_above_baseline: Au(0),
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depth_below_baseline: Au(0),
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ascent: Au(0),
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}
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InlineMetrics::new(Au(0), Au(0), Au(0))
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}
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_ => {
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InlineMetrics {
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@ -2114,6 +2097,23 @@ impl Fragment {
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ascent: self.border_box.size.block,
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}
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}
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};
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fn inline_metrics_of_block(flow: &FlowRef, style: &ServoComputedValues) -> InlineMetrics {
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// See CSS 2.1 § 10.8.1.
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let block_flow = flow.as_block();
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let is_auto = style.get_position().height == LengthOrPercentageOrAuto::Auto;
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let baseline_offset = flow.baseline_offset_of_last_line_box_in_flow();
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let baseline_offset = match baseline_offset {
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Some(baseline_offset) if is_auto => baseline_offset,
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_ => block_flow.fragment.border_box.size.block,
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};
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let start_margin = block_flow.fragment.margin.block_start;
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let end_margin = block_flow.fragment.margin.block_end;
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let block_size_above_baseline = baseline_offset + start_margin;
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let depth_below_baseline = flow::base(&**flow).position.size.block - baseline_offset +
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end_margin;
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InlineMetrics::new(block_size_above_baseline, depth_below_baseline, baseline_offset)
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}
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}
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@ -2932,3 +2932,4 @@ impl Encodable for DebugId {
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e.emit_u16(self.0)
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}
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}
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@ -158,6 +158,12 @@ pub struct Line {
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/// ~~~
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pub green_zone: LogicalSize<Au>,
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/// The minimum block size above the baseline for this line, as specified by the style.
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pub minimum_block_size_above_baseline: Au,
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/// The minimum depth below the baseline for this line, as specified by the style.
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pub minimum_depth_below_baseline: Au,
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/// The inline metrics for this line.
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pub inline_metrics: InlineMetrics,
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}
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@ -172,11 +178,44 @@ impl Line {
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visual_runs: None,
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bounds: LogicalRect::zero(writing_mode),
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green_zone: LogicalSize::zero(writing_mode),
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minimum_block_size_above_baseline: minimum_block_size_above_baseline,
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minimum_depth_below_baseline: minimum_depth_below_baseline,
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inline_metrics: InlineMetrics::new(minimum_block_size_above_baseline,
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minimum_depth_below_baseline,
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minimum_block_size_above_baseline),
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}
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}
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/// Returns the new metrics that this line would have if `new_fragment` were added to it.
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///
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/// FIXME(pcwalton): this assumes that the tallest fragment in the line determines the line
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/// block-size. This might not be the case with some weird text fonts.
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fn new_inline_metrics(&self, new_fragment: &Fragment, layout_context: &LayoutContext)
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-> InlineMetrics {
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if !new_fragment.is_vertically_aligned_to_top_or_bottom() {
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let fragment_inline_metrics = new_fragment.inline_metrics(layout_context);
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self.inline_metrics.max(&fragment_inline_metrics)
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} else {
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self.inline_metrics
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}
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}
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/// Returns the new block size that this line would have if `new_fragment` were added to it.
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/// `new_inline_metrics` represents the new inline metrics that this line would have; it can
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/// be computed with `new_inline_metrics()`.
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fn new_block_size(&self,
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new_fragment: &Fragment,
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new_inline_metrics: &InlineMetrics,
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layout_context: &LayoutContext)
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-> Au {
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let new_block_size = if new_fragment.is_vertically_aligned_to_top_or_bottom() {
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max(new_fragment.inline_metrics(layout_context).block_size(),
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self.minimum_block_size_above_baseline + self.minimum_depth_below_baseline)
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} else {
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new_inline_metrics.block_size()
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};
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max(self.bounds.size.block, new_block_size)
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}
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}
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int_range_index! {
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@ -406,29 +445,6 @@ impl LineBreaker {
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fragment.border_box.size.inline - old_fragment_inline_size;
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}
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// FIXME(eatkinson): this assumes that the tallest fragment in the line determines the line
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// block-size. This might not be the case with some weird text fonts.
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fn new_inline_metrics_for_line(&self, new_fragment: &Fragment, layout_context: &LayoutContext)
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-> InlineMetrics {
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if !new_fragment.is_vertically_aligned_to_top_or_bottom() {
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let fragment_inline_metrics = new_fragment.inline_metrics(layout_context);
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self.pending_line.inline_metrics.max(&fragment_inline_metrics)
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} else {
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self.pending_line.inline_metrics
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}
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}
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fn new_block_size_for_line(&self, new_fragment: &Fragment, layout_context: &LayoutContext)
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-> Au {
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let new_block_size = if new_fragment.is_vertically_aligned_to_top_or_bottom() {
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max(new_fragment.inline_metrics(layout_context).block_size(),
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self.minimum_block_size_above_baseline + self.minimum_depth_below_baseline)
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} else {
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self.new_inline_metrics_for_line(new_fragment, layout_context).block_size()
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};
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max(self.pending_line.bounds.size.block, new_block_size)
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}
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/// Computes the position of a line that has only the provided fragment. Returns the bounding
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/// rect of the line's green zone (whose origin coincides with the line's origin) and the
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/// actual inline-size of the first fragment after splitting.
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@ -558,7 +574,10 @@ impl LineBreaker {
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// `green_zone.block < self.pending_line.bounds.size.block`, then we committed a line that
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// overlaps with floats.
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let green_zone = self.pending_line.green_zone;
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let new_block_size = self.new_block_size_for_line(&fragment, layout_context);
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let new_inline_metrics = self.pending_line.new_inline_metrics(&fragment, layout_context);
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let new_block_size = self.pending_line.new_block_size(&fragment,
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&new_inline_metrics,
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layout_context);
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if new_block_size > green_zone.block {
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// Uh-oh. Float collision imminent. Enter the float collision avoider!
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if !self.avoid_floats(flow, fragment, new_block_size) {
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@ -726,14 +745,16 @@ impl LineBreaker {
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let indentation = self.indentation_for_pending_fragment();
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self.pending_line.range.extend_by(FragmentIndex(1));
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if !fragment.is_inline_absolute() {
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if !fragment.is_inline_absolute() && !fragment.is_hypothetical() {
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self.pending_line.bounds.size.inline = self.pending_line.bounds.size.inline +
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fragment.margin_box_inline_size() +
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indentation;
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self.pending_line.inline_metrics =
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self.new_inline_metrics_for_line(&fragment, layout_context);
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self.pending_line.new_inline_metrics(&fragment, layout_context);
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self.pending_line.bounds.size.block =
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self.new_block_size_for_line(&fragment, layout_context);
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self.pending_line.new_block_size(&fragment,
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&self.pending_line.inline_metrics,
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layout_context);
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}
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self.new_fragments.push(fragment);
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@ -1040,8 +1061,9 @@ impl InlineFlow {
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// to do.
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let fragment = fragments.get_mut(fragment_index.to_usize());
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let fragment_inline_metrics = fragment.inline_metrics(layout_context);
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let mut block_start = line.bounds.start.b +
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line.inline_metrics.block_size_above_baseline -
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let line_block_metrics = LineBlockMetrics::new(line, fragment, layout_context);
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let mut block_start = line_block_metrics.start +
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line_block_metrics.size_above_baseline -
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fragment_inline_metrics.ascent;
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for style in fragment.inline_styles() {
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@ -1061,21 +1083,21 @@ impl InlineFlow {
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block_start = block_start - super_offset
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}
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vertical_align::T::text_top => {
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block_start = line.bounds.start.b +
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line.inline_metrics.block_size_above_baseline -
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block_start = line_block_metrics.start +
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line_block_metrics.size_above_baseline -
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minimum_block_size_above_baseline
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}
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vertical_align::T::text_bottom => {
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block_start = line.bounds.start.b +
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line.inline_metrics.block_size_above_baseline +
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block_start = line_block_metrics.start +
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line_block_metrics.size_above_baseline +
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minimum_depth_below_baseline -
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fragment.border_box.size.block
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}
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vertical_align::T::top => {
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block_start = line.bounds.start.b
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block_start = line_block_metrics.start
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}
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vertical_align::T::bottom => {
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block_start = line.bounds.start.b + line.bounds.size.block -
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block_start = line_block_metrics.start + line_block_metrics.size -
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fragment.border_box.size.block
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}
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vertical_align::T::LengthOrPercentage(LengthOrPercentage::Length(length)) => {
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@ -1261,13 +1283,18 @@ impl InlineFlow {
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}
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pub fn baseline_offset_of_last_line(&self) -> Option<Au> {
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// Find the last line that doesn't consist entirely of hypothetical boxes.
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self.last_line_containing_real_fragments().map(|line| {
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line.bounds.start.b + line.bounds.size.block - line.inline_metrics.depth_below_baseline
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})
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}
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// Returns the last line that doesn't consist entirely of hypothetical boxes.
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fn last_line_containing_real_fragments(&self) -> Option<&Line> {
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for line in self.lines.iter().rev() {
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if (line.range.begin().get()..line.range.end().get()).any(|index| {
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!self.fragments.fragments[index as usize].is_hypothetical()
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}) {
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return Some(line.bounds.start.b + line.bounds.size.block -
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line.inline_metrics.depth_below_baseline)
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return Some(line)
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}
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}
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None
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@ -1496,8 +1523,8 @@ impl Flow for InlineFlow {
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&mut AbsoluteAssignBSizesTraversal(layout_context.shared_context()));
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}
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self.base.position.size.block = match self.lines.last() {
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Some(ref last_line) => last_line.bounds.start.b + last_line.bounds.size.block,
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self.base.position.size.block = match self.last_line_containing_real_fragments() {
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Some(last_line) => last_line.bounds.start.b + last_line.bounds.size.block,
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None => Au(0),
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};
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@ -1877,3 +1904,32 @@ enum LineFlushMode {
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No,
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Flush,
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}
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struct LineBlockMetrics {
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start: Au,
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size: Au,
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size_above_baseline: Au,
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}
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impl LineBlockMetrics {
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fn new(line: &Line, fragment: &Fragment, layout_context: &LayoutContext) -> LineBlockMetrics {
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if !fragment.is_hypothetical() {
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return LineBlockMetrics {
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start: line.bounds.start.b,
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size: line.bounds.size.block,
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size_above_baseline: line.inline_metrics.block_size_above_baseline,
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}
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}
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let hypothetical_inline_metrics = line.new_inline_metrics(fragment, layout_context);
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let hypothetical_block_size = line.new_block_size(fragment,
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&hypothetical_inline_metrics,
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layout_context);
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LineBlockMetrics {
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start: line.bounds.start.b,
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size: hypothetical_block_size,
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size_above_baseline: hypothetical_inline_metrics.block_size_above_baseline,
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}
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}
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}
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-center.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-flex-end.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-spacearound-negative.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-spacearound.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-spacebetween-negative.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-spacebetween-only.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[flexbox_justifycontent-spacebetween.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-005.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-017.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-029.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-041.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-053.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-065.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-077.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-089.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-105.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-137.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-143.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-145.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vlr-149.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-004.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-016.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-028.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-040.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-052.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-064.htm]
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type: reftest
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expected: FAIL
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|
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@ -1,3 +0,0 @@
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[abs-pos-non-replaced-vrl-076.htm]
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type: reftest
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expected: FAIL
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|
|
@ -1,3 +0,0 @@
|
|||
[abs-pos-non-replaced-vrl-088.htm]
|
||||
type: reftest
|
||||
expected: FAIL
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
[abs-pos-non-replaced-vrl-104.htm]
|
||||
type: reftest
|
||||
expected: FAIL
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
[abs-pos-non-replaced-vrl-136.htm]
|
||||
type: reftest
|
||||
expected: FAIL
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
[abs-pos-non-replaced-vrl-144.htm]
|
||||
type: reftest
|
||||
expected: FAIL
|
||||
|
|
@ -2420,6 +2420,30 @@
|
|||
"url": "/_mozilla/css/inline_absolute_hypothetical_clip_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_hypothetical_line_metrics_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_hypothetical_line_metrics_a.html",
|
||||
"references": [
|
||||
[
|
||||
"/_mozilla/css/inline_absolute_hypothetical_line_metrics_ref.html",
|
||||
"=="
|
||||
]
|
||||
],
|
||||
"url": "/_mozilla/css/inline_absolute_hypothetical_line_metrics_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_hypothetical_metrics_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_hypothetical_metrics_a.html",
|
||||
"references": [
|
||||
[
|
||||
"/_mozilla/css/inline_absolute_hypothetical_metrics_ref.html",
|
||||
"=="
|
||||
]
|
||||
],
|
||||
"url": "/_mozilla/css/inline_absolute_hypothetical_metrics_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_out_of_flow_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_out_of_flow_a.html",
|
||||
|
|
@ -16142,6 +16166,30 @@
|
|||
"url": "/_mozilla/css/inline_absolute_hypothetical_clip_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_hypothetical_line_metrics_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_hypothetical_line_metrics_a.html",
|
||||
"references": [
|
||||
[
|
||||
"/_mozilla/css/inline_absolute_hypothetical_line_metrics_ref.html",
|
||||
"=="
|
||||
]
|
||||
],
|
||||
"url": "/_mozilla/css/inline_absolute_hypothetical_line_metrics_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_hypothetical_metrics_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_hypothetical_metrics_a.html",
|
||||
"references": [
|
||||
[
|
||||
"/_mozilla/css/inline_absolute_hypothetical_metrics_ref.html",
|
||||
"=="
|
||||
]
|
||||
],
|
||||
"url": "/_mozilla/css/inline_absolute_hypothetical_metrics_a.html"
|
||||
}
|
||||
],
|
||||
"css/inline_absolute_out_of_flow_a.html": [
|
||||
{
|
||||
"path": "css/inline_absolute_out_of_flow_a.html",
|
||||
|
|
|
|||
|
|
@ -0,0 +1,12 @@
|
|||
<!DOCTYPE html>
|
||||
<meta charset="utf-8">
|
||||
<link rel="match" href="inline_absolute_hypothetical_line_metrics_ref.html">
|
||||
<style>
|
||||
body {
|
||||
margin: 0;
|
||||
padding: 0;
|
||||
}
|
||||
</style>
|
||||
<img width=25 height=25 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWP4z8DwHwAFAAH/q842iQAAAABJRU5ErkJggg=="><!--
|
||||
--><img style="position: absolute" width=100 height=100 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYPj/HwADAgH/xCAAOgAAAABJRU5ErkJggg=="><!--
|
||||
--><img style="position: absolute" width=50 height=50 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgaGD4DwAChAGA2FJdiQAAAABJRU5ErkJggg==">
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
<!DOCTYPE html>
|
||||
<meta charset="utf-8">
|
||||
<style>
|
||||
body {
|
||||
margin: 0;
|
||||
padding: 0;
|
||||
}
|
||||
img {
|
||||
display: block;
|
||||
position: absolute;
|
||||
top: 0;
|
||||
}
|
||||
</style>
|
||||
<img style="left: 0" width=25 height=25 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWP4z8DwHwAFAAH/q842iQAAAABJRU5ErkJggg=="><!--
|
||||
--><img style="left: 25px" width=100 height=100 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYPj/HwADAgH/xCAAOgAAAABJRU5ErkJggg=="><!--
|
||||
--><img style="left: 25px" width=50 height=50 src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgaGD4DwAChAGA2FJdiQAAAABJRU5ErkJggg==">
|
||||
|
||||
|
|
@ -0,0 +1,15 @@
|
|||
<!DOCTYPE html>
|
||||
<meta charset="utf-8">
|
||||
<link rel="match" href="inline_absolute_hypothetical_metrics_ref.html">
|
||||
<style>
|
||||
body, html {
|
||||
margin: 0;
|
||||
font-size: 36px;
|
||||
}
|
||||
span {
|
||||
position: absolute;
|
||||
right: 0;
|
||||
}
|
||||
</style>
|
||||
A<span>B
|
||||
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
<!DOCTYPE html>
|
||||
<meta charset="utf-8">
|
||||
<style>
|
||||
body, html {
|
||||
margin: 0;
|
||||
font-size: 36px;
|
||||
}
|
||||
div {
|
||||
position: absolute;
|
||||
}
|
||||
#a {
|
||||
left: 0;
|
||||
}
|
||||
#b {
|
||||
right: 0;
|
||||
}
|
||||
</style>
|
||||
<div id=a>A</div><div id=b>B</div>
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue