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LibWeb: Bail parsing transform-origin if the parsed value is null
Passing a value of a type different than number or length-percentage to transform-origin returned a null pointer, and we didn't take care of that path before. This patch fixes a crash caused by an incorrect CSS declaration, such as `transform-origin: "center"`. Fixes #21609
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<script src="../include.js"></script>
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<script>
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test(() => {
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function serialize(input) {
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const e = document.createElement("div");
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e.style.transformOrigin = input;
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const serialized = e.style.transformOrigin;
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println(input + " => " + (serialized === '' ? '(invalid)' : serialized));
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}
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for (transformOrigin of [
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'center',
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'10px',
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'25%',
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'left 20%',
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'20px bottom',
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'top right',
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'"center"',
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]) {
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serialize(transformOrigin);
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}
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});
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</script>
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