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style: Add readability backplate for all elements containing text when HCM or a11y theme is active.

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Differential Revision: https://phabricator.services.mozilla.com/D42979
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Morgan Reschenberg 2019-10-04 16:44:49 +00:00 • committed by Emilio Cobos Álvarez
parent d43632c9f8
commit 1c1437df59
1 changed files with 10 additions and 0 deletions
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10
components/style/properties/cascade.rs
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@ -362,9 +362,19 @@ fn should_ignore_declaration_when_ignoring_document_colors(
// Treat background-color a bit differently. If the specified color is
// anything other than a fully transparent color, convert it into the
// Device's default background color.
// Also: for now, we treat background-image a bit differently, too.
// background-image is marked as ignored, but really, we only ignore
// it when backplates are disabled (since then text may be unreadable over
// a background image, if we're ignoring document colors).
// Here we check backplate status to decide if ignoring background-image
// is the right decision.
{
let background_color = match **declaration {
PropertyDeclaration::BackgroundColor(ref color) => color,
// In the future, if/when we remove the backplate pref, we can remove this
// special case along with the 'ignored_when_colors_disabled=True' mako line
// for the "background-image" property.
PropertyDeclaration::BackgroundImage(..) => return !static_prefs::pref!("browser.display.permit_backplate"),
_ => return true,
};