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Test Info:

<!DOCTYPE html>
<style>
* {
text-decoration-line: underline blink;
-webkit-appearance: progress-bar;
columns: 11px;
}
#x4 {
-webkit-user-modify: read-write;
animation: keyframes4 2s;
}
</style>
<style>
@keyframes keyframes0 {
20% {
scroll-padding-left: 1em
}
}
@keyframes keyframes3 {
20% {
scroll-padding-block-end: auto
}
}
@keyframes keyframes4 {
60% {
background-position: 65%
}
}
</style>
<script>
function main() {
const sheet1 = document.styleSheets[1];
sheet1.deleteRule(2);
x4.hspace;
sheet1.deleteRule(1);
x4.checkValidity();
sheet1.deleteRule(0);
}
</script>
<body onload="main()">
<object id="x4"> A </object>
</body>