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This test makes sure that combining grapheme clusters with Tag codepoints (U+E0000 - U+E007F) join correctly. The test passes if you don't see anything below.
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🏴󠁧󠁢󠁥󠁮󠁧󠁿
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<div style="position: absolute; left: 0px; top: 0px; width: 750px; height: 120px; background: white;"></div>
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