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style: Be more strict when setting the root font size.

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Before this commit, we assumed that if the element had no parent element, it was
the root of the document, which is plain false, since we can arrive there from,
let's say, getComputedStyle on a detached node.

Bug: 1374062
Reviewed-By: heycam
MozReview-Commit-ID: 65DxdzXgd0J
This commit is contained in:
Emilio Cobos Álvarez 2017-06-21 12:16:43 +02:00
parent 82884050be
commit 1b2fd3fe85
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GPG key ID: 056B727BB9C1027C
5 changed files with 26 additions and 29 deletions
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8
components/style/matching.rs
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@ -17,8 +17,8 @@ use invalidation::element::restyle_hints::{RESTYLE_CSS_ANIMATIONS, RESTYLE_CSS_T
use invalidation::element::restyle_hints::{RESTYLE_SMIL, RESTYLE_STYLE_ATTRIBUTE};
use invalidation::element::restyle_hints::RestyleHint;
use log::LogLevel::Trace;
use properties::{ALLOW_SET_ROOT_FONT_SIZE, PROHIBIT_DISPLAY_CONTENTS, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP};
use properties::{AnimationRules, CascadeFlags, ComputedValues};
use properties::{IS_ROOT_ELEMENT, PROHIBIT_DISPLAY_CONTENTS, SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP};
use properties::{VISITED_DEPENDENT_ONLY, cascade};
use properties::longhands::display::computed_value as display;
use rule_tree::{CascadeLevel, StrongRuleNode};
@ -33,7 +33,7 @@ use stylist::RuleInclusion;
///
/// Controls where we inherit styles from, and whether display:contents is
/// prohibited.
#[derive(PartialEq, Copy, Clone)]
#[derive(PartialEq, Copy, Clone, Debug)]
enum CascadeTarget {
/// Inherit from the parent element, as normal CSS dictates, _or_ from the
/// closest non-Native Anonymous element in case this is Native Anonymous
@ -273,8 +273,8 @@ trait PrivateMatchMethods: TElement {
}
if self.is_native_anonymous() || cascade_target == CascadeTarget::EagerPseudo {
cascade_flags.insert(PROHIBIT_DISPLAY_CONTENTS);
} else {
cascade_flags.insert(ALLOW_SET_ROOT_FONT_SIZE);
} else if self.is_root() {
cascade_flags.insert(IS_ROOT_ELEMENT);
}
// Grab the inherited values.