Example analysis of three style methods (id, class, style) in css-CSS Tutorial-php.cn

Home

Web Front-end

CSS Tutorial

Example analysis of three style methods (id, class, style) in css

黄舟

Jul 20, 2017 am 09:17 AM

classstyle

We can use three methods to apply styles to an object (such as div, span, table).

1: Use # to define the style and use the id to apply the style to the object.
Example:

<!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=gb2312" /> 
<title>Id</title> 
<style type="text/css"><!-- 
#STYLE_1 { font-size: 20px; } 
--></style> 
</head> 
<body> 
<div id="STYLE_1">用Id来给对象应用样式</div> 
</body> 
</html>

2: Use . to define the style, and use class to apply the style to the object.
Example:

<!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=gb2312" /> 
<title>Id</title> 
<style type="text/css"><!-- 
.STYLE_1 { font-size: 20px; } 
--></style> 
</head> 
<body> 
<div class="STYLE_1">用class来给对象应用样式</div> 
</body> 
</html>

3: Do not define a style, use style directly to apply styles to objects.
Example:

<!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=gb2312" /> 
<title>Id</title> 
</head> 
<body> 
<div style="font-size:20px">用style来给对象应用样式</div> 
</body> 
</html>

The effect of using these three methods is the same, but what we need to pay attention to is the priority issue between these three methods.
What happens if we use the above three methods to define styles for an object at the same time?
For example, we first define a #STYLE { font-size:12px; } and then define a .STYLE { font-size:14px; } and finally use style="font-size:16px;" on the object. The code is as follows:

<!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=gb2312" /> 
<title>Id</title> 
<style type="text/css"><!-- 
#STYLE { font-size: 12px; } 
.STYLE { font-size: 14px; } 
--></style> 
</head> 
<body> 
<div id="STYLE" class="STYLE" style="font-size:16px">用三种方式同时来给对象应用样式</div> 
</body> 
</html>

In this case, the browser will apply styles to the object according to the priority of the three methods, namely style>id>class. In the above example, the text in the div will be displayed at 16px size.

The above is the detailed content of Example analysis of three style methods (id, class, style) in css. For more information, please follow other related articles on the PHP Chinese website!

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

Where should 'Subscribe to Podcast' link to?Apr 16, 2025 pm 12:04 PM

For a while, iTunes was the big dog in podcasting, so if you linked "Subscribe to Podcast" to like:

Browser Engine DiversityApr 16, 2025 pm 12:02 PM

We lost Opera when they went Chrome in 2013. Same deal with Edge when it also went Chrome earlier this year. Mike Taylor called these changes a "Decreasingly

UX Considerations for Web SharingApr 16, 2025 am 11:59 AM

From trashy clickbait sites to the most august of publications, share buttons have long been ubiquitous across the web. And yet it is arguable that these

Weekly Platform News: Apple Deploys Web Components, Progressive HTML Rendering, Self-Hosting Critical ResourcesApr 16, 2025 am 11:55 AM

In this week's roundup, Apple gets into web components, how Instagram is insta-loading scripts, and some food for thought for self-hosting critical resources.

Git Pathspecs and How to Use ThemApr 16, 2025 am 11:53 AM

When I was looking through the documentation of git commands, I noticed that many of them had an option for . I initially thought that this was just a

A Color Picker for Product ImagesApr 16, 2025 am 11:49 AM

Sounds kind of like a hard problem doesn't it? We often don't have product shots in thousands of colors, such that we can flip out the with . Nor do we

A Dark Mode Toggle with React and ThemeProviderApr 16, 2025 am 11:46 AM

I like when websites have a dark mode option. Dark mode makes web pages easier for me to read and helps my eyes feel more relaxed. Many websites, including

Some Hands-On with the HTML Dialog ElementApr 16, 2025 am 11:33 AM

This is me looking at the HTML element for the first time. I've been aware of it for a while, but haven't taken it for a spin yet. It has some pretty cool and

See all articles