1. Brother selector: ① Adjacent sibling selector: the sibling element after the element, selector 1 + selector 2; ② Universal sibling selector: all sibling elements after the element, selector 1 ~ selector 2;
2. Attribute selector: attr represents the attribute name, elem represents the element name; ①[attr]: all elements with attr attribute in the page; ②elem[attr]: all elem elements with attr attribute in the page; ③elem[attr1 ][attr2]...: All elem elements in the page with both attr1 and attr2 attributes...; ④elem[attr=value]: All elem elements in the page with attr attributes and their values are value; ⑤elem[attr ~=value]: All elem elements in the page with attr attributes and their value lists containing independent values (mostly used for element class attributes); ⑥elem[attr^=firstchar]: All elem elements in the page with attr attributes and their values starting with elem elements starting with firstchar (a letter or string); ⑦elem[attr$=lastchar]: All elem elements in the page with attr attributes and whose values end with lastchar (a character or string); ⑧elem[attr*=everchar ]: All elem elements in the page with attr attribute and whose value contains everchar (a character or string) character;
3. Target pseudo-class: ~: target, highlighting the html anchor;
4. Element status pseudo-class: ①~: enabled, each enabled element; ②~: disabled, each disabled element; ③~: checked, each selected element (radio/check box );
5. Structural pseudo-classes: ①~: first-child, the first child element of its parent element; ②~: last-child, the last child element of its parent element; ③~: nth-child (n), its parent The nth child element of the element; ④~: empty, all elements without child elements (no child elements means no content, no spaces and line breaks); ⑤~: only-child, the only child element among its parent elements;
6. Negative pseudo-class: ~: not (selector), all elements in this element that do not satisfy the selector selector;
7. Pseudo element selector: ①~: first-line or ~:: first-line, the first line of the element; ②~: first-letter or ~:: first-letter, the first character of the element; ③~ ::selection, the area selected by the user under this element;
8. Counter: ① Declare/reset counter: counter-reset: counter name value; (* value can be omitted, default is 0; multiple declarations can be made at one time, counter-reset: name 1 value 1 name 2 value 2...; Counter declaration cannot be placed on the used element;); ②Counter increment: counter-increment: counter name increment value; (* cannot be omitted, the default value is 1, placed in the used element;); ③Counter call: counter (Counter name); (Place in calling element);
9. Content generation: ① Selector: :before and :after, before/after the generated position; ②Attribute: content, inserted content, value: url() (insert image)/string ("plain text") /Counter (regular numbers);
10. Multiple columns: ① Split columns: column-count: number; ② Column gap: column-gap: number px; ③ Column rules: column-rule: wide style color; (* is column gap border style); ④ Compatible Performance: IE10+, Opera supported;
11. CSS Hack: ① Internal CSS class: style rules plus prefix; -: IE6; +: IE7; ② Selector: selector plus prefix: *: IE6; *+: IE7; ③ Header reference: Content...; (* Conditions: a, gt: greater than; b, gte: greater than or equal to; c, lt: less than; d, lte: less than or equal to;! Not IE;); ④ Media query: @media screen{};

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

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.

AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Zend Studio 13.0.1
Powerful PHP integrated development environment