CSS使用通配符作为选择器

本文介绍了一种使用CSS选择器结合jQuery实现自动点击网页中特定img元素的方法,通过选择包含speakerimg关键字的img标签,实现了在Chrome浏览器控制台直接运行的脚本,自动点击古诗文网站上的播放按钮。

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### CSS Universal Selector Usage The CSS universal selector (*) matches every single element within the document. This selector can be used to apply styles broadly across all elements or in combination with other selectors for more specific targeting[^1]. #### Basic Syntax Example To demonstrate how this works, consider applying a margin of zero pixels universally: ```css * { margin: 0; } ``` This code snippet removes default margins from all HTML elements. #### Combining With Other Selectors When combined with type selectors (e.g., `div`, `p`), descendant combinators, child combinators, or general sibling combinators, the universal selector allows for even finer control over styling rules without specifying exact tag names: ```css /* Applies padding only inside any div */ div * { padding: 5px; } /* Targets direct children paragraphs under sections */ section > p { color: blue; } /* Affects all spans that follow an h1 anywhere as siblings */ h1 ~ span { font-weight: bold; } ``` In these examples, while not explicitly shown due to formatting constraints, each application showcases different ways the universal selector integrates into broader CSS strategies beyond just global declarations. --related questions-- 1. How does specificity work when using the universal selector alongside class or ID selectors? 2. What are some performance implications associated with extensive use of the universal selector in large-scale web projects? 3. Can you provide scenarios where combining the universal selector with pseudo-elements would prove beneficial? 4. Is there any difference between browser implementations regarding support for the universal selector?
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