首先需要搞清楚几个基本概念<br /> 1.内嵌样式：<br /> 写在元素标签内的例如：<div style="background-color:red"> </div><br /> 2.内联样式：<br /> 写在head的style例如：<head><br /> <style><br /> div{<br /> background-color:red;<br /> }<br /> </style><br /> </head><br /> 3.外部样式：<br /> link标签引入进来的例如：<link rel="stylesheet" href="1.css"/><br /> 4.important:只要设置了important的优先级永远最高。例如：border:1px solid red !important; <br /> 优先级：！important > 内嵌（标签内）> 内联（style）=外部;<br />说明：这里很多初学者都会误会内联优先级要高与外部，实际上是相等的。例如：<br /> <head><br /> <link rel="stylesheet" href="1.css"/>//名为1的css文件中有div{background:blue;}<br /> <style><br /> div{ background-color；red;<br /> }<br /> </style><br /> </head><br /> 此时div的背景色为red;<br />
<head><br /> <style><br /> div{ background-color；red;<br /> }<br /> </style><br /> <link rel="stylesheet" href="1.css"/>//名为1的css文件中有div{background:blue;}<br /> </head> 此时div的背景色为blue；<br />
选择器权重值：内嵌：1000；<br /> id:0100;<br /> class或伪类：0010；<br /> 元素或伪元素：0001；<br /> *：0000；<br />说明：权重值越大优先级越高；权重值可以累加，但是不会越位，例如：<br /> 嵌套十层div，然后有一个div元素选择器，该选择的权重值为000 10，而不是0010，仍旧比class或伪类选择器的权重值小。
权重值：内嵌（1000）>id（0100）>class/伪类（0010）>元素/伪元素（0001）> * 权重值越高优先级越高。 important永远最高。
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 PMThe 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 PMThis 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
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe 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 are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe 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
What is the purpose of the <iframe> tag? What are the security considerations when using it?Mar 20, 2025 pm 06:05 PMThe article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
Atom editor mac version download
The most popular open source editor
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
