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[filter-effects-1] Elements with invalid filters #564

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shallawa opened this issue Jul 3, 2024 · 1 comment
Open

[filter-effects-1] Elements with invalid filters #564

shallawa opened this issue Jul 3, 2024 · 1 comment

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@shallawa
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shallawa commented Jul 3, 2024

In https://drafts.fxtf.org/filter-effects/#FilterProperty, it is not clear what should happen if an invalid filter is applied to an element.

  1. Should the element be rendered without any filter?
  2. Should the rendering of the element be omitted entirely?
  3. Should the invalid filter be corrected so the element with a valid filter be displayed?

The browsers disagree in displaying this test case:

<style>
    svg {
        border: 1px red solid;
        width: 400px;
        height: 300px;
    }
    .box {
        width: 200px;
        height: 200px;
        background-color: green;
        margin: 20px;
    }
    .filtered-1 {
        filter: drop-shadow(10px 10px -4px #4444dd);
    }
    .filtered-2 {
        filter: url(#shadow);
    }
</style>
<body>
    <p>A div element with invalid CSS filter:</p>
    <div class="box filtered-1"></div>
    <p>A div element with invalid referenced SVG filter:</p>
    <div class="box filtered-2"></div>
    <p>A rect element with invalid SVG filter:</p>
    <svg>
        <filter id="shadow">
            <feDropShadow dx="10" dy="10" stdDeviation="-4" flood-color="#4444dd" />
        </filter>
        <rect width="200" height="200" style="fill:green; filter:url(#shadow);" />
    </svg>
</body>
  1. Safari does not display any SVG element with invalid SVG filter
  2. Chrome seems to correct the SVG filter and is able to display any element that references this SVG filter
  3. FireFox does no display any element with invalid SVG filters
@shallawa
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shallawa commented Jul 3, 2024

@annevk pointed out #237 (comment) seems to discuss a subset of this issue.

@shallawa shallawa mentioned this issue Jul 3, 2024
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@shallawa