[Webkit-unassigned] [Bug 225282] New: Invalid media query keyword values should not be parsable
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Sun May 2 10:02:42 PDT 2021
https://bugs.webkit.org/show_bug.cgi?id=225282
Bug ID: 225282
Summary: Invalid media query keyword values should not be
parsable
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: CSS
Assignee: webkit-unassigned at lists.webkit.org
Reporter: ntim at apple.com
Examples:
prefers-color-scheme: none
prefers-color-scheme: aghadshudfsjhdsfkjhdsfdsfa
prefers-color-scheme: visible
prefers-color-scheme: hidden
prefers-color-scheme: -webkit-sticky
prefers-color-scheme: cssisawesome
Ditto for prefers-contrast
WebKit all considers them as parsable...
This shows up in our WPT failures (notably the none cases for prefers-contrast/prefers-color-scheme).
Example snippet to reproduce:
function query_is_css_parseable(query) {
const style = document.createElement('style');
style.type = 'text/css';
document.head.appendChild(style);
const sheet = style.sheet;
try {
sheet.insertRule("@media " + query + "{}", 0);
return sheet.cssRules.length == 1 &&
sheet.cssRules[0].media.mediaText != "not all";
} finally {
while (sheet.cssRules.length)
sheet.deleteRule(0);
style.remove();
}
}
query_is_css_parseable("(prefers-color-scheme: -webkit-sticky)") // should return false
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