CSS is Cascading Style Sheets. CSS technology is used in WEB development to effectively control page layout, fonts, colors, backgrounds and other effects. With just a few simple modifications, you can change the look and format of your web pages. CSS3 is an upgraded version of CSS. This new set of standards provides richer and more practical specifications, such as: box model, list module, hyperlink method, language module, background and border, text effects, multi-column layout, etc. Currently, there are Many browsers have successively supported this upgraded specification, such as: Firefox, Chrome, Safari, Opera, etc.
1.CSS3 can make rounded tables
Corresponding attribute: border-radius
2. Specially formulated text effect attributes. In the past, adding special effects to text on web pages could only use the filter attribute. CSS3 has specially formulated an attribute to add text effects, and it does not only add shadow effects.
Corresponding attribute: font-effect
3. The styles of link underlines are enriched, including wavy lines, dotted lines, dotted lines, etc. You can also change the color and length of the underline arbitrarily, and there are also corresponding effect styles of the horizontal line, the effect is similar to the underline
Corresponding attribute: text-underline-style
text-underline-color
text-underline-mode
text-underline-position
4. The function of marking has been added. When taking notes, we usually click a few dots or make a circle below to express the key points. The CSS3 industry has begun to add this function
Corresponding attribute: font-emphasize-style
font-emphasize-posintion
CSS3 border properties:
border-color:
border-image:
border-corner-image
border-radius
CSS3 background properties:
background-origin
border
Padding
content
background-clip
background-size
Multiple-backgrounds
CSS3 text effect:
text-shadow
text-overflow

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.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract


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