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<!DOCTYPE html>
<title>CSS Transitions Test: Cascading @starting-style</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
.color-transition {
transition: color 100s steps(2, start);
}
@starting-style {
#t1 { color: red; }
}
#t1 { color: green; }
@starting-style {
div#t2 { color: lime; }
}
#t2 { color: green; }
#t3 { color: green; }
@starting-style {
#t3 { color: red; }
}
#t3 > div { color: green; }
#t4 { color: green; }
#t4[hidden] { color: red; }
#t4 > div { color: lime; }
@starting-style {
#t4 > div { color: inherit; }
}
#t5 { color: green; }
@starting-style {
#t5 { color: black; }
}
#t5 > div { color: lime; }
@starting-style {
#t5 > div { color: inherit; }
}
</style>
<div id="t1" hidden class="color-transition"></div>
<div id="t2" hidden class="color-transition"></div>
<div id="t3" hidden>
<div class="color-transition"></div>
</div>
<div id="t4" hidden>
<div class="color-transition"></div>
</div>
<div id="t5" hidden class="color-transition">
<div class="color-transition"></div>
</div>
<script>
setup(() => {
assert_true(supportsStartingStyle(), "Prerequisite: @starting-style parses");
});
promise_test(async t => {
await waitForAnimationFrames(2);
t1.removeAttribute("hidden");
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(t1).color, "rgb(0, 128, 0)",
"No transition of color");
}, "Overridden @starting-style - order of appearance");
promise_test(async t => {
t2.removeAttribute("hidden");
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(t2).color, "rgb(0, 192, 0)",
"Transition of color");
}, "@starting-style with higher specificity");
promise_test(async t => {
t3.removeAttribute("hidden");
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(t3.firstElementChild).color, "rgb(0, 128, 0)",
"No transition of color");
}, "Starting style does not inherit from parent starting style");
promise_test(async t => {
assert_equals(getComputedStyle(t4).color, "rgb(255, 0, 0)",
"Parent transition started");
t4.removeAttribute("hidden");
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(t4).color, "rgb(0, 128, 0)",
"Parent changed to green");
assert_equals(getComputedStyle(t4.firstElementChild).color, "rgb(0, 192, 0)",
"Transition started from parent's after-change style color");
}, "Starting style inheriting from parent's after-change style");
promise_test(async t => {
t5.removeAttribute("hidden");
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(t5).color, "rgb(0, 64, 0)",
"Parent transition started");
assert_equals(getComputedStyle(t5.firstElementChild).color, "rgb(0, 192, 0)",
"Transition started from parent's after-change style color");
}, "Starting style inheriting from parent's after-change style while parent transitioning");
</script>
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