Without getting into a lot of details, the browser engine needs to look at all your rules and make decisions as to which ones apply to a given element. To do this, the engine needs to look at the rule selector, and this happens from right to left. For example, when the engine sees...
5.11 Pseudo-classes伪类5.11.1:first-child pseudo-class :first-child伪类The :first-child pseudo-class matches an element that is the first child element of some other element. :first-child伪类匹配某个元素的第一个子元素。 Example(s): In the following example, the selector matches any P elemen...
The CSS rule below will affect every HTML element on the page: *{ text-align:center; color:blue; } Try it Yourself » The CSS Grouping Selector The grouping selector selects all the HTML elements with the same style definitions.
Add or remove classes to an element: Click the Classes button to the right of the Filter Styles field display checkboxes for each of the classes applied to the element. Select or deselect the checkboxes. In this new Classes section is another + icon. This feature allows you to add a new ...
If there are two or more CSS rules that point to the same element, the selector with the highest specificity will "win", and its style declaration will be applied to that HTML element. Think of specificity as a hierarchy that determines which style declaration is ultimately applied to an el...
selector.class:pseudo-element{property:value;} :first-line 伪元素 "first-line" 伪元素用于向文本的首行设置特殊样式。 在下面的例子中,浏览器会根据 "first-line" 伪元素中的样式对 p 元素的第一行文本进行格式化: 实例 p:first-line{color:#ff0000;font-variant:small-caps; ...
The current value of the select field. These objects must follow the same structure as an options element. Thus, the following would work:// default element Simple Select const value = { value: "fox", label: "🦊 Fox" }; // default element with `disabled` Simple Select const value =...
scopes– groups of classes which never used with classes from other groups on the same element All sections are optional. Value oftags,idsandclassesshould be an array of a string, value ofscopesshould be an array of arrays of strings. Other values are ignoring. ...
(possibly omitted). Pseudo-class names are case-insensitive. Some pseudo-classes are mutually exclusive, while others can be applied simultaneously to the same element. Pseudo-classes may be dynamic, in the sense that an element may acquire or lose a pseudo-class while a user interacts with ...
scopes– groups of classes which never used with classes from other groups on the same element All sections are optional. Value oftags,idsandclassesshould be an array of a string, value ofscopesshould be an array of arrays of strings. Other values are ignoring. ...