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Learn how to use the :active CSS pseudo-class to style elements that are being activated by the user, such as buttons or links. See examples, syntax, specifications, and browser compatibility for this selector.
The first :active (the colon matters) refers to the active pseudo css class which is automatically set by the browser. The second .active refers to a simple css class that you (or your program) need to apply to the element.. So to answer your second question, the first one is applied automatically by the browser as soon as a user has clicked (activated) a link on your webpage, whereas the ...
Why didn't you bring the "focus"element, as advantage over "visited". Changes every time you click in a new link, avoiding the confusion and letting work the active element every time, perhaps putting together active and focus you get the effect of selection besides the "hover"ing with the mouse every new (not used last time) link…
a:active MUST come after a:hover in the CSS definition in order to be effective! Pseudo-class names are not case-sensitive. Pseudo-class names are not case-sensitive. Pseudo-classes and HTML Classes
The: active selector is used in styling an active link of the web page. Style display when the user clicks on the link. This selector is different from :link, :visited and: hover selectors. The main use of : active selector is on the links but it can be used on all elements. Syntax: :active{ //CSS p
:active is a CSS pseudo-class.It specifies and selects an element based on a state—the active state—and is used to apply styles to an element when it matches that state.. The :active pseudo-class is a dynamic class which applies when an element is being activated by the user. It is often used to target and style an element when it's active (as the name suggests).
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CSS :active 选择器 完整CSS选择器参考手册 实例 选择激活的链接样式： a:active { background-color:yellow; } 尝试一下 » 定义和用法 ...
a:active: applies styles when a user activates the link by clicking on it. a:visited: apples styles when the state changes to visited. Below is an example of applying different colors for every state of the anchor tag: a:link { color: #ff3e00; } a:hover { color: #ffee00; } a:active { color: #d900ff; } a:visited { color: #51ff00; }