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 ...
Grid classes apply to devices with screen widths greater than or equal to the breakpoint sizes, and override grid classes targeted at smaller devices. Therefore, e.g. applying any .col-md-* class to an element will not only affect its styling on medium devices but also on large devices if...
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; ...
_element`, value: `before` }, ] } ] } ] */ const compoundSelectorList = groupCompoundSelectors(selectorList, {splitPseudoElements: false}); /* [ { type: `selector, nodes: [ { type: `compound_selector`, nodes: [ { type: `class`, value: `a` }, { type: `pseudo_element`, ...
Note When grouping selectors, remember that the comma starts an entirely new selector. Pseudo-Classes and Pseudo-Elements Style rules are usually attached to an element based on its position in the document structure; however, CSS uses the concepts of pseudo-classes and pseudo-elements to permit...
Classes aren’t the only type of identifiers you can use in your CSS selectors of course. One interesting example is using attribute selectors and do substring matching like `[class*="icon-"]` . This type of selector requires the browser engine to not only check if the element has a cla...
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. ...
the same kind. In addition to targeting specific attributes of an element likeidorclass, it is possible to select an element based on its relationship or proximity to another element. For example, you can select an HTML element that follows a preceding element or the first element in a...