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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/filter-turbulence-invalid-001.html 

<!DOCTYPE html>
<title>CSS Filter Effects: feTurbulence with negative values from baseFrequency</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#element-attrdef-feturbulence-basefrequency">
<link rel="help" href="https://crbug.com/1068863"/>
<link rel="match" href="reference/filter-turbulence-invalid-001-ref.html">
<meta name="assert" content="This test checks that negative baseFrequency values are unsupported for feTurbulence.">
<style>
.target {
  display: inline-block;
  width: 100px;
  height: 100px;
  background-color: red;
}
</style>
<div class="target" style="filter: url(#fn1)"></div>
<div class="target" style="filter: url(#fn2)"></div>
<div class="target" style="filter: url(#tb1)"></div>
<div class="target" style="filter: url(#tb2)"></div>
<svg height="0" color-interpolation-filters="sRGB">
    <!-- type=fractalNoise -->
    <filter id="fn1" x="0" y="0" width="1" height="1">
        <feTurbulence type="fractalNoise" baseFrequency="-1 1"/>
        <feComponentTransfer>
            <feFuncR type="discrete" tableValues="1 0 1"/>
            <feFuncG type="discrete" tableValues="0 0.502 0"/> <!-- map [0..1/3] -> 0; [1/3...2/3] -> 0.502; [2/3..1] -> 0 -->
            <feFuncB type="discrete" tableValues="0"/>
            <feFuncA type="discrete" tableValues="0 1 0"/>
        </feComponentTransfer>
    </filter>

    <filter id="fn2" x="0" y="0" width="1" height="1">
        <feTurbulence type="fractalNoise" baseFrequency="1 -1"/>
        <feComponentTransfer>
            <feFuncR type="discrete" tableValues="1 0 1"/>
            <feFuncG type="discrete" tableValues="0 0.502 0"/> <!-- map [0..1/3] -> 0; [1/3...2/3] -> 0.502; [2/3..1] -> 0 -->
            <feFuncB type="discrete" tableValues="0"/>
            <feFuncA type="discrete" tableValues="0 1 0"/>
        </feComponentTransfer>
    </filter>

    <!-- type=turbulence -->
    <filter id="tb1" x="0" y="0" width="1" height="1">
        <feTurbulence type="turbulence" baseFrequency="-1 1"/>
        <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.502, 0 0 1 0 0, 0 0 0 1 1"/>
    </filter>

    <filter id="tb2" x="0" y="0" width="1" height="1">
        <feTurbulence type="turbulence" baseFrequency="1 -1"/>
        <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.502, 0 0 1 0 0, 0 0 0 1 1"/>
    </filter>
</svg>