In WordPress 4.6 the Categories and Tags screens (and all the custom terms screens that use the same edit-tags.php page) will change in order to make the visual order of the main elements match the tab order. This change is focused on helping people who use the keyboard to navigate the content or use assistive technologies such as screen readers. If you’re a plugin or theme author and you’re providing custom functionalities in these screens, there are a few things you should check. Why it matters For accessibility, the visual order should always match the tab order. The main functionality in a page should just be the first thing in the source markup and other parts of the user interface should never be “skipped”. The screenshot below illustrates the current Tags screen. The main content is split in two columns. The first element in the source is the right column with the table to list the terms followed by the tag cloud for the popular tags and the form to add new tags. The current order of the main content elements in the Tags screen. On page load, the initial focus is set on the first focusable field in the form which is the third and last block of content
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