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chromium/third_party/blink/web_tests/svg/text/combining-character-queries.html 

<!DOCTYPE HTML>
<meta charset="utf8">
<style>
    .testTextRun {
        font-size: 35px;
    }
    #highlightContainer rect {
        fill-opacity: 0.3;
    }
</style>
<svg width="600px" height="500px" xmlns="http://www.w3.org/2000/svg">
    <g id="highlightContainer"/>

    <!-- multiple combining diacritics in LTR -->
    <text x="50" y="50" class="testTextRun" font-family="cursive">ab&#x030c;c&#x030c;&#x030c;</text>
    <text x="200" y="50" class="testTextRun" font-family="serif">ab&#x030c;c&#x030c;&#x030c;</text>
    <text x="350" y="50" class="testTextRun" font-family="sans-serif">ab&#x030c;c&#x030c;&#x030c;</text>

    <!-- multiple combining diacritics in RTL -->
    <text x="100" y="125" class="testTextRun" font-family="cursive" direction="rtl">&#8207;a&#8207;b&#x030c;&#8207;c&#x030c;&#x030c;</text>
    <text x="250" y="125" class="testTextRun" font-family="serif" direction="rtl">&#8207;a&#8207;b&#x030c;&#8207;c&#x030c;&#x030c;</text>
    <text x="400" y="125" class="testTextRun" font-family="sans-serif" direction="rtl">&#8207;a&#8207;b&#x030c;&#8207;c&#x030c;&#x030c;</text>

    <!-- multiple combining diacritics on ligatures in LTR -->
    <!-- MacOS has differences with multiple diacritics in cursive font family so this is skipped, see: https://crbug.com/669693. -->
    <!-- <text x="50" y="200" class="testTextRun" font-family="cursive">fi&#x030c; ffi&#x030c;&#x030c;</text> -->
    <text x="200" y="200" class="testTextRun" font-family="serif">fi&#x030c; ffi&#x030c;&#x030c;</text>
    <text x="350" y="200" class="testTextRun" font-family="sans-serif">fi&#x030c; ffi&#x030c;&#x030c;</text>

    <!-- combining diacritics on ligatures in mixed bidi runs -->
    <text x="50" y="275" class="testTextRun" font-family="cursive">ff&#x030c;&#1600;&#1600;&#1604;&#1575;ff&#x030c;</text>
    <text x="200" y="275" class="testTextRun" font-family="serif">ff&#x030c;&#1600;&#1600;&#1604;&#1575;ff&#x030c;</text>
    <text x="350" y="275" class="testTextRun" font-family="sans-serif">ff&#x030c;&#1600;&#1600;&#1604;&#1575;ff&#x030c;</text>

    <!-- combining diacritics which are wider than characters in mixed bidi runs -->
    <text x="50" y="350" class="testTextRun" font-family="cursive"> &#x030c;&#64944;i&#819;</text>
    <!-- Linux has differences with space width in the following two runs so a period is used as a workaround. -->
    <text x="200" y="350" class="testTextRun" font-family="serif">.&#x030c;&#64944;i&#819;</text>
    <text x="350" y="350" class="testTextRun" font-family="sans-serif">.&#x030c;&#64944;i&#819;</text>
</svg>
<script src="resources/highlightGlyphs.js"></script>
<script>
    highlightGlyphs(document.querySelectorAll('.testTextRun'), highlightContainer);
</script>