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ladybird/Tests/LibWeb/Text/input/DOM/CharacterData-substringData-break-surrogate-pair.html
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<!DOCTYPE html>
<script src="../include.js"></script>
<script>
test(() => {
const str = '\uD83D\uDC36'; // 🐶
let t = document.createTextNode(str);
println("Before substringData:");
for (let i = 0; i < t.length; ++i) {
println("[" + i + "]: " + t.data.charCodeAt(i));
}
// Break the surrogate pair
const invalidSubstring = t.substringData(0, 1);
println("After substringData(0, 1):");
for (let i = 0; i < invalidSubstring.length; ++i) {
println("[" + i + "]: " + invalidSubstring.charCodeAt(i));
}
});
</script>