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Frédéric Wang
c68a474344
This test verifies the MathML3 rule that the `accentunder`/`accent` attributes are ignored when an `munderover` element (and similar scripted elements) is laid out as an `msubsup` element (i.e. when the base is a `movablelimits` operator in `displaystyle="false"`). More specifically, setting `accentunder`/`accent` to `true` normally prevents the `scriptlevel` to be incremented in an `munderover` element (and similar scripted elements) but this test verifies that this rule does not hold when such an element is laid out as an `msubsup` element. In MathML Core, the CSS-based mechanism is slightly different: the scripts of `munderover` (and similar scripted elements) always have `math-depth: add(1)` in the UA sheet but `font-size: inherit` if the corresponding `accentunder`/`accent` attribute is set to true. This means that by default, the `accentunder`/`accent` scripts are not drawn smaller even when laid out as an `msubsup`, contrary to MathML3. Consequently, we keep this test as internal for now. Differential Revision: https://phabricator.services.mozilla.com/D203577
39 lines
1.4 KiB
HTML
39 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Test accent/accentunder</title>
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=669713">
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<link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.munder">
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<link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.mover">
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<link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.munderover">
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<link rel="match" href="scriptlevel-movablelimits-accent-ref.html">
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<meta name="assert" content="Verify accentunder='true' or accent='true' is ignored when an underover element is laid out as a subsup element.">
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</head>
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<body>
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<!-- Per MathML3, setting accentunder/accent to true prevents scriptlevel
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from being incremented, however such attributes should be ignored when
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scripts are drawn as subcript/superscript, which is the case here
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because U+2211 N-ARY SUMMATION defaults to movablelimits="true". -->
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<math displaystyle="false">
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<munderover accentunder="true" accent="true">
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<mo>∑</mo>
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<mi>a</mi>
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<mi>b</mi>
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</munderover>
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</math>
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<math displaystyle="false">
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<munder accentunder="true">
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<mo>∑</mo>
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<mi>a</mi>
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</munder>
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</math>
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<math displaystyle="false">
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<mover accent="true">
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<mo>∑</mo>
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<mi>a</mi>
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</mover>
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</math>
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</body>
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</html>
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