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chromium/third_party/blink/web_tests/svg/text/invalid-non-bmp-characters.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<svg id="svg" height="0" font-size="100">
    <text id="text">
        <!-- invalid non-bmp character followed by a valid character -->
        <tspan>&#x90012;a</tspan>
        <!-- many invalid non-bmp characters followed by a valid character -->
        <tspan>&#x90012;&#x90012;&#x90012;&#x90012;a&#x90012;&#x90012;&#x90012;&#x90012;a</tspan>
        <!-- alternating valid and invalid non-bmp characters -->
        <tspan>&#128514;&#x90012;&#128514;&#x90012;&#128514;&#x90012;</tspan>
        <!-- invalid non-bmp characters in rtl -->
        <tspan direction="rtl">نشاط&#128514;نشاط&#x90012;&#x90012;ن&#x90012;شاط&#128514;نش&#x90012;اط&#x90012;ا</tspan>
    </text>
</svg>
<script>
test(function() {
  text.getComputedTextLength();
  svg.parentElement.removeChild(svg);
}, 'Text runs with invalid non-bmp characters should not crash.');
</script>