


The priority of css introduction method and the priority difference of different selectors_html/css_WEB-ITnose
We all know that there are 3 basic settings for css, namely
1. Inline is also called embedded. For example:
<div style='background:red'></div>
2. Inline, wrapped with style tags in the html file. For example:
<html> <style type='text/css'> div{ background:red; } </style></html>
3. Link type, referenced using link tags in html files. For example:
<html> <link rel='stylesheet' type='text/css' href='style.css'/></html>
Note: There is another This @import writing method is not commonly used and has compatibility issues. It is ignored.
When we use these three methods at the same time to set styles on the same target element, the priority is inline > inline > link
Generally, in the same way (file), whoever comes next has the highest priority. Many people know this,
But many people ignore that different selectors also have priorities.
First of all, let’s recall the css selector type
#id name{ attribute name: attribute value; }
.class name{ attribute name: attribute value; }
tag name{ attribute name: attribute value; }
This is one of the 3 basic selectors. There are compound selectors that combine them with each other
We write a css style file and introduce it into the css.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>css优先级讨论</title></head><link rel="stylesheet" type="text/css" href="base.css"/><body> <div id='red' class='blue' >颜色</div></body></html>
base.css file As follows
@charset "utf-8";/* CSS Document */#red{ color:red;}.blue{ color:blue;}div{ color:black;}
These three style settings are all for one element and are all in the link file. They should override the previous ones in order, but the browser The result of the operation is
This means that the id selector has the highest priority. Please see the figure below for the specific selector weight
Through this picture, we can calculate which setting has a higher priority. At the same time, we will also realize that the priority of the link may be greater than the embedded one! In practice, we often encounter this kind of error caused by problems. Now let’s look at a practical example
In this page, the color attribute of the button "Next" is set three times, and all of them are In the base.css file, the subsequent color values do not overwrite the previous settings and become white, because the first circle uses a class label weight of 11, the second circle uses a class weight of 10, and the last one uses a label weight of 1. Naturally, the effective solution for the first setting is very simple. Change the second selector and the result is as follows
The weight values are equal and the back covers the front. That’s it. It’s not enough for errors. Please point it out.

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

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



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

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

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

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.

The article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.

The 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.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
