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Test Info:

<style>
*:defined {
outline: currentColor dashed;
}
*:read-write {
animation: kf 200ms ease-out 16384 alternate-reverse backwards
}
@keyframes kf {
20% {
clip-path: polygon(1px 0.75em, 128px 100%)
}
}
</style>
<script>
document.addEventListener("DOMContentLoaded", () => {
a.createCaption()
})
</script>
<table id="a" contenteditable="true" align="left">