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They and their callees work with the result of `GetRoot()` which is the document element or the body element. If the body is not editable, `Selection` should not be updated in non-editable region nor `<br>` elements should not be inserted in both non-focused editable elements and non-editable elements. Therefore, they should run only when the document element or the `<body>` element is editable. To keep testing crashtests as reported, this patch makes tests which have `contenteditable` except `<html>` and `<body>` initialize `Selection` as what we've done. And clean up the tests for helping to port them to WPT in the future (bug 1725850). Differential Revision: https://phabricator.services.mozilla.com/D157408
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