In css: use of focus pseudo-class, that is, setting styles for elements that have received focus
The above is passed: focus to The input input box has set the style when it gets focus
: When focus is used in the navigation bar of the page, the code example is as follows:
Addition:
When the element gets the focus, if the element is a If there is a valid link, you can enter the link address by pressing the "Enter" key;
You can also press the "Tab" key in the page to traverse all available The element that gets focus makes it focus;
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