Html example(see the source code)- open this in a new tab,and try pressing the tab key; after a few presses, you should see the tab focus start to move through the different focusable elements; the focused elements are given a highlighted default style in every browser(it differs slightly between different browsers) so that you can tell what element is focused.
その後、Tabキーを押して幅を変更するか、右クリックしてデフォルト値を承認します。
Then, you can press the TAB key to change the width, or just right-click to accept the default value.
When the source orderdoes not match the visual order, the tab order through the content must reflect the logical relationships in the content that are displayed visually.
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