css3 rounded border, border shadow_html/css_WEB-ITnose
border-radius adds a rounded border to an element, in css3. IE9 chrome safari5 firefox4 are now supported. Borders can be set to input divs, etc. Similar to border, the four corners can be set together or individually.
Syntax: border-radius: 1-4 length|% / 1-4 length|%;
-moz-border-radius:10px; supports old firefox
-webkit-border-radius:10px;Supports chrome
Set the value of each radius in the order of top-left, top-right, bottom-right, bottom-left. If bottom-left is omitted, it is the same as top-right. If bottom-right is omitted, it is the same as top-left. If top-right is omitted, it is the same as top-left.
Example 1:
border-radius:2px;
Equivalent to:
border-top-left-radius:2px;
border-top-right-radius:2px;
border-bottom-right-radius:2px;
border-bottom-left-radius:2px; >Example 2:
Border-radius:2em 1em 4em / 0.5em 3em;
Equivalent to:
border-top-left-radius:2em 0.5;
border-top-right-radius:1em 3em;
border-bottom-right-radius:4em 0.5em;
border-bottom-left-radius:1em 3em ;
box-shadow adds one or more shadows to the box. IE9, Firefox 4, Chrome, Opera, and Safari 5.1.1 support the box-shadow attribute.
Syntax: box-shadow: h-shadow v-shadow blur spread color inset;
h-shadow, v-shadow are required. Horizontal and vertical shadow position. Assignment is allowed. blur optional, blur distance. spread optional, the size of the shadow. color optional, the color of the shadow. inset is optional and changes the outer shadow (outset) to the inner shadow.
Example: box-shadow: inset 3px 3px 6px #ccc;

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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 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 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.

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