A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of the selected element(s).
In CSS, ::after creates a pseudo-element that is the last child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.
This article will discuss the CSS pseudo-elements that are part of CSS 2.1 – :first-letter, :first-line, :before, and :after –and how the :before and :after pseudo-elements can be exploited to create some interesting effects, without compromising the simplicity of your HTML. But first,...
@containerDefine styles for elements in container, depending on the container's size or style contentUsed with the :before and :after pseudo-elements, to insert generated content counter-incrementIncreases or decreases the value of one or more CSS counters ...
For the purposes of box generation and layout, the element must be treated as if it had been replaced with its children and pseudo-elements in the document tree.“ 大至意思是:“元素本身不产生任何边界框,而元素的子元素与伪元素仍然生成边界框,元素文字照常显示。为了同时照顾边界框与布局,处理这个...
css-position-1/2/3/4Position-related pseudo-classes css-scoping-1Shadow DOM selectors (:host,:host-context(),::slotted()) css-pseudo-4Modern pseudo-elements (::selection,::backdrop, etc.) css-shadow-parts-1::part()for styling shadow DOM components ...
Text nodes (or sequences of text nodes?) in the DOM tree are wrapped inside a::textpseudo-element in the CSS element tree. These::textpseudo-elements must act as if they were assigneddisplay: contentsvia a rule in the UA origin. Therefore, they do not generate any boxes and are treate...
For elements, it's done with .active. However, you may use .active on s (and include the aria-pressed="true" attribute) should you need to replicate the active state programmatically. Button element No need to add :active as it's a pseudo-class, but if you need to force the same...
Pseudo-elements, like ::before, ::after, ::placeholder, and ::selection 伪元素 before 创建一个元素作为当前元素的第一个子元素 after Note that if you’ve disabled our preflight base styles, the content property will not be set to an empty string by default, and you will need to include ...
Vectors represent sub-selectors and can be used to target pseudo-elements, nested elements or media queries.The first element is either string or a keyword, which again is a pre-defined aliases that will be replaced by its value when building. A String must either start with a @ when ...