


In CSS2, you can specify dedicated style sheets for different media devices (such as screens, printers), and now with the help of the Media Queries feature of CSS3, you can even more Effectively implement this function. You can add certain conditions for media types, detect devices and apply different style sheets.
For example, you can put styles for display on large screens and styles for mobile devices in a style document so that different devices can render without changing the content of the document. Different interface looks. Read this article to learn the basic functions of CSS3 Media Queries and examples of excellent foreign websites that use the Media Queries features of CSS3.
Watch this online demo, resize your browser window and see how it changes.
Max Width
The following styles will be applied when the width of the visible area is less than 600px.
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@media screen and ( max-width : 600px ) {
.class {
background : #ccc ;
}
}
If you want to link to a separate stylesheet, put the following code inside the
tag.
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Min Width
The following styles will be applied when the width of the visible area is greater than 900px.
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@media screen and ( min-width : 900px ) {
.class {
background : #666 ;
}
}
Multiple Media Queries
You can also use a matching condition. The following style will be used when the width of the visible area is between 600px and 900px time is applied.
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@media screen and ( min-width : 600px ) and ( max-width : 900px ) {
.class {
background : #333 ;
}
}
Device Width
The following style will be triggered on devices where max-device-width is 480px. (Tip: max-device-width is the actual resolution of the device, while max-width refers to the viewable area resolution.)
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@media screen and (max-device- width : 480px ) {
.class {
background : #000 ;
}
}
For iPhone 4
The following styles are specially written for iPhone 4 (Author: Thomas Maier).
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For iPad
You can also use media query Detect orientation (portrait or landscapse) on iPad (Author: Cloud Four).
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Media Queries for IE
Unfortunately, IE8 and older browsers do not support CSS3 Media Queries, but you can use Javascript to make up for it. Here are some solutions Solution:
Attach : CSS3 Media Queries Browser Compatibility Table
CSS3 Media Queries Application Cases
Need to support the Media Queries feature below Browse in browsers: IE9, Firefox, Chrome and Safari. Browse each site to see how the page layout responds to changes in the browser window.
Hicksdesign
Colly
The layout of the page will be in 1 column according to the size of the browser , to switch between 2 columns and 4 columns.
A List Apart
Tee Gallery
This is very similar to the previous Colly, but the pictures in this case will also change as the layout changes. The trick is to use percentages to set the width of the element.
Summary
Remember: just because your stylesheet is optimized for mobile devices doesn’t mean your site is suitable for display on mobile devices. To be truly mobile-optimized, reduce image size, number of tags, size of loaded assets, etc. CSS3 Media Queries are for design presentation, not optimization.

Self-closingtagsinHTMLandXMLaretagsthatclosethemselveswithoutneedingaseparateclosingtag,simplifyingmarkupstructureandenhancingcodingefficiency.1)TheyareessentialinXMLforelementswithoutcontent,ensuringwell-formeddocuments.2)InHTML5,usageisflexiblebutr

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.


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