90 lines
3.4 KiB
HTML
90 lines
3.4 KiB
HTML
<!DOCTYPE html>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script src=/resources/testdriver.js></script>
|
|
<script src=/resources/testdriver-actions.js></script>
|
|
<script src=/resources/testdriver-vendor.js></script>
|
|
<style></style>
|
|
<!--
|
|
Web-font styled text that gets resized after an interaction stops LCP
|
|
observation should not make a new LCP emission.
|
|
-->
|
|
<textarea id='input'></textarea>
|
|
<div class="test">LCP: Web Font Styled Text Resize</div>
|
|
<script>
|
|
function addCSSRules() {
|
|
styleSheet = document.styleSheets[0];
|
|
fontRuleSet = "@font-face {\
|
|
font-family: 'ADTestFaceInteraction';\
|
|
src: url('/fonts/AD.woff');\
|
|
font-display: swap;\
|
|
}";
|
|
fontAtRule = ".test {\
|
|
font-family: 'ADTestFaceInteraction';\
|
|
} ";
|
|
styleSheet.insertRule(fontRuleSet);
|
|
styleSheet.insertRule(fontAtRule);
|
|
}
|
|
|
|
function LCPEntryList(t) {
|
|
return new Promise(resolve => {
|
|
let = lcpEntries = [];
|
|
new PerformanceObserver((entryList, observer) => {
|
|
lcpEntries = lcpEntries.concat(entryList.getEntries());
|
|
if (lcpEntries) {
|
|
// Adding timeout to wait a bit more so that if there are more than
|
|
// expected LCP entries emitted, they can be observed.
|
|
t.step_timeout(() => {
|
|
resolve(lcpEntries);
|
|
observer.disconnect();
|
|
}, 200);
|
|
}
|
|
}).observe({ type: 'largest-contentful-paint', buffered: true });
|
|
});
|
|
}
|
|
|
|
promise_test(async t => {
|
|
await document.fonts.ready;
|
|
let system_font_size = document.getElementsByClassName('test')[0].offsetHeight;
|
|
|
|
// Verify an LCP entry is emitted.
|
|
let entryList = await LCPEntryList(t);
|
|
assert_equals(entryList.length, 1, 'Text with system font should make a LCP emission.');
|
|
|
|
let lcpEntryBeforeInteraction = entryList[0];
|
|
|
|
// Add event listener so that CSS rule would be added after there's an
|
|
// input.
|
|
let inputElement = document.getElementById('input');
|
|
inputElement.addEventListener('keydown', addCSSRules);
|
|
|
|
// Send key as input.
|
|
await test_driver.send_keys(inputElement, 'k');
|
|
|
|
// Wait for web font to load.
|
|
await document.fonts.ready;
|
|
|
|
// Verify web font is downloaded.
|
|
assert_own_property(window, 'PerformanceResourceTiming', "ResourceTiming not supported");
|
|
let url = '/fonts/AD.woff';
|
|
var absoluteURL = new URL(url, location.href).href;
|
|
assert_equals(performance.getEntriesByName(absoluteURL).length, 1, 'Web font should be downloaded.');
|
|
|
|
// Verify web font is available.
|
|
assert_true(document.fonts.check('16px ADTestFaceInteraction'), 'Font should be the web font added');
|
|
|
|
// Verify web font is applied.
|
|
let web_font_size = document.getElementsByClassName('test')[0].offsetHeight;
|
|
assert_not_equals(web_font_size, system_font_size, 'Web font swap should happen');
|
|
|
|
// Assert there is only 1 LCP entry, which verifies the added web font does
|
|
// not make a new LCP entry after an input.
|
|
entryList = await LCPEntryList(t);
|
|
assert_equals(entryList.length, 1, 'Text with system font should not make a LCP emission.');
|
|
|
|
// Verify the LCP entry is the same one emitted before interaction by
|
|
// asserting the size is the same.
|
|
assert_equals(lcpEntryBeforeInteraction.size, entryList[0].size, 'There should be only 1 LCP entry emitted.');
|
|
|
|
}, "LCP should be not updated if the web font styled text resize occurs after an interaction happens");
|
|
</script>
|