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LibWeb: Implement @supports selector(.foo)

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This is defined in
https://www.w3.org/TR/css-conditional-4/#at-supports-ext which just
became a CR. :^)
This commit is contained in:
Sam Atkins 2022-02-19 17:22:05 +00:00 • committed by Andreas Kling
parent c50ea8c1dd
commit 7880718fa8
4 changed files with 93 additions and 9 deletions
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50
Base/res/html/misc/supports.html
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@ -25,6 +25,23 @@
}
}
/* Selectors */
@supports selector(.simple) {
.p5 {
background-color: lime;
}
}
@supports selector(a#more > .complicated.case:nth-child(42)) {
.p6 {
background-color: lime;
}
}
@supports selector(.easy) or selector(.....nope) {
.p7 {
background-color: lime;
}
}
.negative {
background-color: red;
}
@ -48,6 +65,21 @@
background-color: lime;
}
}
@supports selector(.....nope) {
.n5 {
background-color: lime;
}
}
@supports selector(::-webkit-input-placeholder) {
.n6 {
background-color: lime;
}
}
@supports selector(32) or selector(thing[foo??????bar]) {
.n7 {
background-color: lime;
}
}
.success {
background-color: lime;
@ -63,16 +95,24 @@
<p class="p2">@supports (color: green) and (width: 50px)</p>
<p class="p3">@supports (color: green) or (flogwizzle: purple)</p>
<p class="p4">@supports (not (flogwizzle: purple))</p>
<p class="p5">@supports selector(.simple)</p>
<p class="p6">@supports selector(a#more > .complicated.case:nth-child(42))</p>
<p class="p7">@supports selector(.easy) or selector(.....nope)</p>
<h1>These should all be red</h1>
<p class="negative n1">@supports (not (color: green))</p>
<p class="negative n2">@supports (color: green) and (width: 50px) or (color: green)</p>
<p class="negative n3">@supports (width: yellow) or (height: green)</p>
<p class="negative n4">@supports (flogwizzle: purple)</p>
<p class="negative n5">@supports selector(.....nope)</p>
<p class="negative n6">@supports selector(::-webkit-input-placeholder)</p>
<p class="negative n7">@supports selector(32) or selector(thing[foo??????bar])</p>
<h1>Testing CSS.supports(property, value)</h1>
<p>These should all be green, meaning they returned true</p>
<ul id="property-success">
</ul>
<p>These should all be red, meaning they returned false</p>
<ul id="property-failure">
</ul>
@ -118,7 +158,10 @@
"color: green",
"(color: green) and (width: 50px)",
"(color: green) or (flogwizzle: purple)",
"not (flogwizzle: purple)"
"not (flogwizzle: purple)",
"selector(.simple)",
"selector(a#more > .complicated.case:nth-child(42))",
"selector(.easy) or selector(.....nope)"
];
for (let text of should_succeed) {
let success = CSS.supports(text);
@ -133,7 +176,10 @@
"not (color: green)",
"(color: green) and (width: 50px) or (color: green)",
"(width: yellow) or (height: green)",
"flogwizzle: purple"
"flogwizzle: purple",
"selector(.....nope)",
"selector(::-webkit-input-placeholder)",
"selector(32) or selector(thing[foo??????bar])"
];
for (let text of should_fail) {
let success = CSS.supports(text);