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<body>
<svg style="display:none">>
<filter id="base">
<feTurbulence baseFrequency="0.03125"/>
</filter>
<filter id="base2d">
<feTurbulence baseFrequency="0.03125, 0.125"/>
</filter>
<filter id="highFrequency">
<feTurbulence baseFrequency="0.0625"/>
</filter>
<filter id="seed">
<feTurbulence baseFrequency="0.03125" seed="100"/>
</filter>
<filter id="numOctaves">
<feTurbulence baseFrequency="0.03125" numOctaves="2"/>
</filter>
<filter id="empty">
<feTurbulence/>
</filter>
<filter id="fractalNoise">
<feTurbulence baseFrequency="0.03125" type="fractalNoise"/>
</filter>
<filter id="stitchTiles">
<feTurbulence baseFrequency="0.03125" stitchTiles="noStitch"/>
</filter>
</body>
<script>
testCases = document.getElementsByTagName("filter");
for (tc of testCases) {
const canvas = document.createElement("canvas");
document.body.appendChild(canvas);
const ctx = canvas.getContext("2d");
ctx.filter = `url(#${tc.id})`;
ctx.fillRect(0, 0, 1, 1);
}
</script>