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<!DOCTYPE html>
<meta charset="UTF-8">
<script>
// This is the constant in nsTextFrame.cpp of the number of lines which
// a text run can be built up to.
const NUM_LINES_TO_BUILD_TEXT_RUNS = 200;
// Push the affecting line to be the last line in the text run.
for (let i = 0; i < NUM_LINES_TO_BUILD_TEXT_RUNS - 1; i++) {
document.write('x<br>');
}
// The exact number here isn't important. It just needs to be large
// enough that '\n' would be inside text after a line break.
for (let i = 0; i < 2000; i++) {
document.write('あ');
}
document.write('\nあ<br>');
// Then this ruby would not get its text run.
document.write('x<ruby>x</ruby>');
</script>
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