CSS层次选择器温故-2 - 怪诞咖啡-HTML Tutorial-php.cn

Home

Web Front-end

HTML Tutorial

CSS层次选择器温故-2 - 怪诞咖啡

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 20, 2016 pm 01:46 PM

1.层次选择器

通过HTML的DOM元素间的层次关系获取元素，层次关系包括后代、父子、相邻兄弟和通用兄弟，通过其中某类关系可以方便快捷地选定需要的元素

2.语法

3.兼容性

IE7以及以上版本

4.后代选择器

也称包含选择器，作用：可以选择某元素的后代元素

eg：【E F】，选中F元素，这里不管F元素是E元素的子元素、孙辈元素或者更深层次的关系，都将被选中

注：后代选择器两选择符之间必须以空格隔开，中间不能有任何其他符号插入

5.子元素选择器

只能选择某元素的子元素，仅仅选中子元素而已

范围比后代选择器小

6.相邻兄弟选择器

可以选择紧接在另一个元素后的元素，它们具有一个相同的父元素（之后的元素，而不是之前的元素）

7.通用兄弟选择器

是CSS3新增加的，用于选择某元素后面的所有兄弟元素，和相邻兄弟选择器类似，都在同一个父元素之中，范围比相邻兄弟选择器广

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?Mar 04, 2025 pm 12:32 PM

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

How to efficiently add stroke effects to PNG images on web pages?Mar 04, 2025 pm 02:39 PM

This article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect

What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PM

The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159

How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PM

The article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.

What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PM

Article discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.

What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PM

The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati

What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PM

The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex

How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PM

This article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit

See all articles