What does focus mean in HTML

In HTML, focus means "focus". The ":focus" selector is used to select the element that has received focus. You only need to set the "element:focus{attribute:attribute value}" style to the element. ":focus" is a pseudo-class that applies to an element that has focus. The selector is applied for the time the element has focus.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

:The focus selector is used to select the element that receives focus.

:focus is a pseudo-class that applies to elements that have focus.

:focus applies to the time the element has focus.

The :focus selector can be used as long as it is an element that can receive keyboard events or other user input. In most cases, the :focus selector is used on links and form elements.

Example:

a:focus {outline: 1px dotted red;} input:focus {background: yellow;}

Note: :focus works on IE8, DOCTYPE must be declared

Example:

     
  
点击文本输入框表单可以看到紫色边框和橘色背景:
 
 用户名: 
 密　码:  
  

Rendering:

Note:

Under normal circumstances, the browser will automatically add an outline around the element when the form element gets focus. The style added by the browser is unique to each browser. Default styles, and often times, default styles look different between each browser.

But for the overall beauty of the page and browser style compatibility, we often need to modify the element style when it gets focus and replace the default style with our own style.

At this time we can use the css :focus selector to set the default style of the element when the browser gets focus.

Recommended learning:html video tutorial

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