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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>CSS Contain: Test content-visibility:hidden reflow counts</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body style="content-visibility: hidden;">
hello
</body>
<script>
let gUtils = SpecialPowers.getDOMWindowUtils(window);
let gTestContainer = document.getElementById("test");
function flushLayout() {
document.documentElement.offsetHeight;
}
function getReflowCount() {
flushLayout();
return gUtils.framesReflowed;
}
function runTestFunctionAndCountReflows(testFunction) {
const beforeCount = getReflowCount();
testFunction();
const afterCount = getReflowCount();
console.log(afterCount - beforeCount);
return afterCount - beforeCount;
}
test(() => {
flushLayout();
const reflows = runTestFunctionAndCountReflows(() => {
document.body.innerText = "something else";
});
assert_equals(reflows, 1, "Reflow only triggered on body.");
}, "Changing text of 'content-visibility: hidden' body only triggers a single reflow.");
</script>
</html>
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