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auto merge of #4934 : glennw/servo/fix-1248, r=pcwalton

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bors-servo 2015-02-16 14:06:52 -07:00
commit 6d2e840bf4
7 changed files with 29 additions and 4 deletions
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12
components/layout/layout_task.rs
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@ -666,7 +666,17 @@ impl LayoutTask {
// FIXME(pcwalton): This is really ugly and can't handle overflow: scroll. Refactor
// it with extreme prejudice.
let mut color = color::white();
// The default computed value for background-color is transparent (see
// http://dev.w3.org/csswg/css-backgrounds/#background-color). However, we
// need to propagate the background color from the root HTML/Body
// element (http://dev.w3.org/csswg/css-backgrounds/#special-backgrounds) if
// it is non-transparent. The phrase in the spec "If the canvas background
// is not opaque, what shows through is UA-dependent." is handled by rust-layers
// clearing the frame buffer to white. This ensures that setting a background
// color on an iframe element, while the iframe content itself has a default
// transparent background color is handled correctly.
let mut color = color::transparent_black();
for child in node.traverse_preorder() {
if child.type_id() == Some(NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLHtmlElement))) ||
child.type_id() == Some(NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLBodyElement))) {