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並前往https://searchfox.org/mozilla-central/source/testing/web-platform/tests/selection/modify.tentative.html

modify.tentative.html - mozsearch - Searchfox

focusOffset, 1);. selection.collapse(em.childNodes[0], 4);. selection.modify("extend", "backward", "word"). assert_equals(selection.focusNode, em.

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