动画
=====================================================================================
1.@keyframes规则
2.animation属性
Webkit内核的浏览器(Safari,chrome)需要加-webit-前缀。
持续时间:
animation-duration
-webkit-animation-duration
时间函数:
animation-timing-function
-webkit-animation-timing-function
延迟时间:
animation-delay
-webkit-animation-delay
动画执行次数:
animation-iteration-count: count / infinite(无限次)
-webkit-animation-iteration-count:
动画播放方向:
animation-direction: normal / reverse /alternate / alternate-reverse
//正常 / 反向 / 第一次正常第二次反向 / 第一次反向第二次正常
-webkit-animation-direction:
动画播放前后的状态:
animation-fill-mode: none / backwards / forwards /both
// 默认值 / 设置播放之前的元素状态和第一个关键帧相同 / 播放后的
状态和最后一个关键帧相同
-webkit-animation-fill-mode:
控制动画运行或暂停:
animation-play-state: running / paused
-webkit-animation-play-state
*****************************************************************************************
所有和animation相关的样式都可以写在animation属性内:
但 1. 至少要有animation-name 和 animation-duration
2. animation-duration在animation-delay之前
div{ height:100px; width:100px; background: url(images/ball.png); background-size:99.5%; animation:myball_1 6s linear infinite alternate, myball_2 6s linear infinite; -webkit-animation:myball_1 6s linear infinite alternate, myball_2 6s linear infinite; animation-play-state:running; -webkit-animation-play-state:running; } div:hover{ animation-play-state:paused; -webkit-animation-play-state:paused; } @keyframes myball_1{ 100%{ transform :rotate(360deg);} } @-webkit-keyframes myball_1{ 100%{transform:rotate(360deg);} } @keyframes myball_2{ 0%,50%,100%{ opacity :1;} 25%,75%{ opacity:0 ;} } @-webkit-keyframes myball_2{ 0%,50%,100%{opacity:1;} 25%,75%{opacity: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.


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