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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<iframe sandbox
style="width: 200px"
srcdoc="<canvas style='text-indent: 50vw; display: block'>Text</canvas>"></iframe>
<script>
onload = function() {
var i = document.querySelector("iframe");
window.w = i.offsetWidth;
i.style.width = "400px";
document.documentElement.className = "";
}
</script>
</html>