none means to invalidate an element in CSS, and is often used in display, border, outline, list-style and other attributes; for example, the "display:none;" attribute means that the setting element is not displayed, "border: none ;" attribute means not to display the border of the element, etc.
The operating environment of this tutorial: windows7 system, css3 version, Dell G3 computer.
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What does none mean in css?
none originally means [none]. In CSS, it means to invalidate an element.
Commonly used in display, border, outline, list-style and other attributes.
display:none; means the setting element is not displayed.
border: none; Indicates that the border of the element is not displayed.
outline: none; means not to display the border after the input box and button get focus.
list-style: none; means not to display symbols in front of list items such as ul and ol.
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