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Test Info:
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<style>
body {
font: 32px sans-serif;
}
.description {
font: 16px serif;
}
div {
position: relative;
height: 3em;
}
div p {
position: absolute;
color: red;
}
p + p {
color: green;
}
.red {
color: red;
}
.green {
color: green;
}
</style>
<body>
<p class=description>In each line, the <span class=green>green</span> glyphs should exactly overlay the <span class=red>red</span> ones:</p>
</body>
<script>
// Some ideographs that should have lang-specific font variants (examples found in
const doingTest = (location.search != "?ref");
const testStr = "今令免入全关具刃化外情才抵次海直真示神空者草蔥角道雇骨";
["zh-CN", "zh-HK", "zh-TW", "ja-JP", "ko-KR", "ja-JP-alalc97"].forEach((lang) => {
let div = document.createElement("div");
document.body.appendChild(div);
// Create two layers of text, red and then green. In the test rendering, one layer
// has the "correct" lang tag, and the other has an ill-formed version with underscore;
// nevertheless we want it to render identically.
let p1 = document.createElement("p");
p1.lang = lang;
p1.textContent = testStr;
div.appendChild(p1);
if (doingTest) {
lang = lang.replace("-", "_");
}
let p2 = document.createElement("p");
p2.lang = lang;
p2.textContent = testStr;
div.appendChild(p2);
});
</script>