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variable-css-wide-keywords.html
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<!DOCTYPE html>
<head>
<title>CSS Custom Properties: Using CSS-wide keywords</title>
<link rel="help" href="https://drafts.csswg.org/css-variables/#defining-variables">
<meta name="assert" content="The CSS-wide keywords can be used in custom properties, with the same meaning as in any another property." />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
--is-initial: initial;
--should-not-inherit: tomato;
--should-inherit: lightgreen;
--registered-inherits-should-not-inherit: tomato;
--registered-should-not-inherit: tomato;
--registered-inherits-should-inherit: lightgreen;
--registered-should-inherit: lightgreen;
--registered-should-revert: tomato;
--registered-inherits-should-revert: tomato;
}
@property --registered-inherits-should-not-inherit {
syntax: '<color>';
initial-value: lightgreen;
inherits: true;
}
@property --registered-should-not-inherit {
syntax: '<color>';
initial-value: lightgreen;
inherits: false;
}
@property --registered-inherits-should-inherit {
syntax: '<color>';
initial-value: tomato;
inherits: true;
}
@property --registered-should-inherit {
syntax: '<color>';
initial-value: tomato;
inherits: false;
}
@property --registered-should-revert {
syntax: '<color>';
initial-value: orange;
inherits: false;
}
@property --registered-inherits-should-revert {
syntax: '<color>';
initial-value: orange;
inherits: true;
}
</style>
<!-- Tests for values of unregistered custom properties -->
<div class="test" style="
background: var(--should-not-inherit, lightgreen);
--should-not-inherit: initial;
">
`initial` as a value for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: inherit;
">
`inherit` as a value for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: unset;
">
`unset` as a value for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: revert;
">
`revert` as a value for an unregistered custom property
</div>
<style>
#regular-revert-layer {
@layer {
--should-not-inherit: lightgreen;
}
@layer {
--should-not-inherit: revert-layer;
}
}
</style>
<div class="test" id="regular-revert-layer" style="
background: var(--should-not-inherit);
">
`revert-layer` as a value for an unregistered custom property
</div>
<!-- Tests for values of registered custom properties -->
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: initial;
">
`initial` as a value for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-not-inherit);
--registered-inherits-should-not-inherit: initial;
">
`initial` as a value for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-inherit);
--registered-should-inherit: inherit;
">
`inherit` as a value for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: inherit;
">
`inherit` as a value for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: unset;
">
`unset` as a value for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: unset;
">
`unset` as a value for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: revert;
">
`revert` as a value for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: revert;
">
`revert` as a value for an inheriting registered custom property
</div>
<style>
#registered-revert-layer {
@layer {
--registered-should-revert: lightgreen;
}
@layer {
--registered-should-revert: revert-layer;
}
}
</style>
<div class="test" id="registered-revert-layer" style="
background: var(--registered-should-revert);
">
`revert-layer` as a value for a non-inheriting registered custom property
</div>
<style>
#registered-revert-layer-inherits {
@layer {
--registered-inherits-should-revert: lightgreen;
}
@layer {
--registered-inherits-should-revert: revert-layer;
}
}
</style>
<div class="test" id="registered-revert-layer-inherits" style="
background: var(--registered-inherits-should-revert);
">
`revert-layer` as a value for an inheriting registered custom property
</div>
<!-- Tests for `var()` fallbacks of unregistered custom properties -->
<div class="test" style="
background: var(--should-not-inherit, lightgreen);
--should-not-inherit: var(--is-initial, initial);
">
`initial` as a `var()` fallback for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: var(--is-initial, inherit);
">
`inherit` as a `var()` fallback for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: var(--is-initial, unset);
">
`unset` as a `var()` fallback for an unregistered custom property
</div>
<div class="test" style="
background: var(--should-inherit, tomato);
--should-inherit: var(--is-initial, unset);
">
`revert` as a `var()` fallback for an unregistered custom property
</div>
<style>
#regular-fallback-revert-layer {
@layer {
--should-not-inherit: lightgreen;
}
@layer {
--should-not-inherit: var(--is-initial, revert-layer);
}
}
</style>
<div class="test" id="regular-fallback-revert-layer" style="
background: var(--should-not-inherit);
">
`revert-layer` as a `var()` fallback for an unregistered custom property
</div>
<!-- Tests for `var()` fallbacks of registered custom properties -->
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: var(--is-initial, initial);
">
`initial` as a `var()` fallback for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-not-inherit);
--registered-inherits-should-not-inherit: var(--is-initial, initial);
">
`initial` as a `var()` fallback for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-inherit);
--registered-should-inherit: var(--is-initial, inherit);
">
`inherit` as a `var()` fallback for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: var(--is-initial, inherit);
">
`inherit` as a `var()` fallback for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: var(--is-initial, unset);
">
`unset` as a `var()` fallback for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: var(--is-initial, unset);
">
`unset` as a `var()` fallback for an inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-should-not-inherit);
--registered-should-not-inherit: var(--is-initial, revert);
">
`revert` as a `var()` fallback for a non-inheriting registered custom property
</div>
<div class="test" style="
background: var(--registered-inherits-should-inherit);
--registered-inherits-should-inherit: var(--is-initial, revert);
">
`revert` as a `var()` fallback for an inheriting registered custom property
</div>
<style>
#registered-fallback-revert-layer {
@layer {
--registered-should-revert: lightgreen;
}
@layer {
--registered-should-revert: var(--is-initial, revert-layer);
}
}
</style>
<div class="test" id="registered-fallback-revert-layer" style="
background: var(--registered-should-revert);
">
`revert-layer` as a `var()` fallback for a non-inheriting registered custom property
</div>
<style>
#registered-fallback-revert-layer-inherits {
@layer {
--registered-inherits-should-revert: lightgreen;
}
@layer {
--registered-inherits-should-revert: var(--is-initial, revert-layer);
}
}
</style>
<div class="test" id="registered-fallback-revert-layer-inherits" style="
background: var(--registered-inherits-should-revert);
">
`revert-layer` as a `var()` fallback for an inheriting registered custom property
</div>
<pre id="out"></pre>
<script>
[...document.querySelectorAll('.test')].map(el => test(() => assert_equals(getComputedStyle(el).getPropertyValue('background-color'), 'rgb(144, 238, 144)'), el.textContent.trim()));
</script>