Css3 calc可使用简单的数学运算计算宽度
calc是单词calculate的缩写,是Css3的一个新的长度单位函数,可以使用简单的数学运算.
Firefox要使用-moz-calc()私有属性,
Chrome要使用-webkit-calc()私有属性,
IE9原生支持标准的不带前缀的写法,
Opera暂还不支持.
运算规则
可以使用 “+” “-” “*” “/” 四则运算(”+”、”-”两个符号边上必须要有空格,而”*”、”/”符号则不是必须的),
可以使用百分比、px、em、rem等单位,
可以混合使用各种单位进行计算.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
.content {
border:1px solid #000;
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(100% - 2px);
}
.content2 {
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(10em + 10px);
}
/*三栏等宽布局*/
.content3 {
margin-left:20px;
/* ‘+’ ‘-’ 符号左右两边加空格, ‘*’ ‘/’ 符号可不加 */
width:calc(100%/3 - 20px);
}
/* n为从0开始的乘数,依次递增1,如:3*0,3*1,3*2等相乘结果后的子元素 */
.content3:nth-child(3n){
margin-left:0;
}
calc是单词calculate的缩写,是Css3的一个新的长度单位函数,可以使用简单的数学运算.
Firefox要使用-moz-calc()私有属性,
Chrome要使用-webkit-calc()私有属性,
IE9原生支持标准的不带前缀的写法,
Opera暂还不支持.
运算规则
可以使用 “+” “-” “*” “/” 四则运算(”+”、”-”两个符号边上必须要有空格,而”*”、”/”符号则不是必须的),
可以使用百分比、px、em、rem等单位,
可以混合使用各种单位进行计算.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
.content {
border:1px solid #000;
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(100% - 2px);
}
.content2 {
/* ‘+’ ‘-’ 符号左右两边加空格 */
width:calc(10em + 10px);
}
/*三栏等宽布局*/
.content3 {
margin-left:20px;
/* ‘+’ ‘-’ 符号左右两边加空格, ‘*’ ‘/’ 符号可不加 */
width:calc(100%/3 - 20px);
}
/* n为从0开始的乘数,依次递增1,如:3*0,3*1,3*2等相乘结果后的子元素 */
.content3:nth-child(3n){
margin-left:0;
}

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.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

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.

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