Brief Note on aria-readonly Support
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TL;DR: Support for aria-readonly is nearly non-existent for the roles I tested. Should you need it, you cannot rely on it. You will be better off revising the pattern where you think you need it. For some background, the aria-readonly property: Indicates that the element is not editable, but is…
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ブラウザやスクリーンリーダーの対応状況からすると、aria-readonly を使うのは時期尚早というレポート。