1174332-1-ref.html

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<!DOCTYPE html>

<html lang="en">

<meta charset="utf-8">

<title>Testcase for filters on canvas</title>

<style>

#checkbox {

  filter: url(#filter);

</style>

<svg style="display: block; height: 0;">

  <defs>

    <filter id="filter" color-interpolation-filters="sRGB" x="-100%" y="-100%" width="300%" height="300%">

      <feMorphology operator="dilate" radius="5" in="SourceAlpha" result="mask"/>

      <feFlood flood-color="blue"/>

      <feComposite operator="in" in2="mask"/>

      <feMerge>

        <feMergeNode/>

        <feMergeNode in="SourceGraphic"/>

      </feMerge>

    </filter>

  </defs>

</svg>

<input type="checkbox" id="checkbox">

<script>

document.getElementById("checkbox").focus();

</script>