<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#text-box-edge">
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#text-box-trim">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@font-face {
font-family: test-font;
src: url(support/cap-x-height.ttf);
}
.spacer {
background: lightgray;
block-size: 100px;
}
#target {
font-family: test-font;
font-size: 100px;
line-height: 2;
text-box-trim: both;
text-box-edge: ex alphabetic;
}
</style>
<div id="container">
<div class="spacer"></div>
<div id="target">A</div>
<div class="spacer"></div>
</div>
<script>
function run_tests(test_names) {
const container = document.getElementById('container');
const container_bounds = container.getBoundingClientRect();
const target = document.getElementById('target');
const target_bounds = target.getBoundingClientRect();
// Test `getBoundingClientRect()` returns the trimmed box size.
test(() => {
assert_equals(target_bounds.top - container_bounds.top, 100);
}, "getBoundingClientRect.top");
test(() => {
assert_equals(target_bounds.height, 20);
}, "getBoundingClientRect.height");
// Test `elementFromPoint()` hits `target` even if the point is above/below
// the client rect, because the inner line box overflows the box.
test(() => {
const result = document.elementFromPoint(10, 90 + container_bounds.top);
assert_equals(result, target);
}, "elementFromPoint: 10px above the client rect");
test(() => {
const result = document.elementFromPoint(10, 130 + container_bounds.top);
assert_equals(result, target);
}, "elementFromPoint: 10px below the client rect");
}
setup({explicit_done: true});
document.fonts.ready.then(() => {
run_tests();
done();
});
</script>
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