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<!DOCTYPE html>
<title>contain-intrinsic-size: auto with various dynamic changes</title>
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#last-remembered">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<div style="height: 2000px;"></div>
<div style="contain-intrinsic-size: auto 1px; contain: size;" id="test">
<div style="height: 50px;" id="child"></div> <!-- make 'test' have a 50px height -->
</div>
<script>
var next_func;
var t = async_test("contain-intrinsic-size: auto");
var log = document.getElementById("log");
var el = document.getElementById("test");
var child = document.getElementById("child");
var observer = new ResizeObserver(function() {
requestAnimationFrame(next_func);
observer.unobserve(el);
});
function step2() {
el.style.contentVisibility = "auto";
el.style.contain = "size";
assert_equals(el.offsetHeight, 50);
child.style.height = "30px";
// We should still use the old saved size.
assert_equals(el.offsetHeight, 50);
el.style.contentVisibility = "";
el.style.contain = "";
assert_equals(el.offsetHeight, 30);
// Need to let resize observer run again to update the size.
next_func = t.step_func_done(finalize);
observer.observe(el);
}
function finalize() {
el.style.contentVisibility = "auto";
el.style.contain = "size";
assert_equals(el.offsetHeight, 30);
}
el.offsetWidth;
t.step(function() {
assert_equals(el.offsetHeight, 1);
el.style.contain = "";
assert_equals(el.offsetHeight, 50);
// Let ResizeObserver run so that the size gets saved.
next_func = t.step_func(step2);
observer.observe(el);
});
</script>
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