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HTML syntax

In HTML syntax, all elements are included in the "<" and ">" start and end identifiers. This map summarizes the classification of elements in detail and summarizes the knowledge points of new elements in HTML5.

Edited at 2023-02-26 19:23:59

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HTML syntax

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HTML syntax

one

All elements are included in the "<" and ">" start and end identifiers, forming an element such as <html>, etc.

In HTML documents, most elements have a start tag and an end tag. Contained between the start tag and the end tag is the element body <p>This is a paragraph</p>

Elements can be nested within each other to form the document structure. Nesting must match, nesting cannot be staggered

two

Content type. The file extension and content type of html5 remain unchanged, still .html or .htm, and the content type is text/html

Document type declaration. <!DOCTYPE html>, case insensitive

three

The file extension must end with .html or .htm

The file name can only consist of English letters, numbers or underscores

Do not include special symbols in the file name, such as spaces, $, etc.

File names are case-sensitive, and there are differences in case between Unix and Windows systems.

The default file name of the website homepage is index.htm or index.html

Any spaces or carriage returns are invalid in the code. There are special markers for inserting spaces or line breaks, which are &nbsp and <br>

Element classification

1. Document structure <html>, <head>, <body>

2. Text format. These elements are used to identify text blocks and come with certain display formats. <title>: identifies the title of the web page. <hi>: i represents 1, 2, 3, 4, 5, and 6, which represent first-level to sixth-level titles respectively. <p>: identifies paragraph text. <pre>: identifies pre-formatted text. <blockquote>: identifies the quoted text.

3. Character format <b>, <i>, <del>, <em>, <sup>, <sub>, <ruby>, <rp>, <rt>

4. List <ul>, <ol>, <li>, <dl>, <dt>, <dd>

5. Hyperlink <a>

6. Multimedia <img>, <embed>, <object>

7. Table <table>, <tr>, <td>, <th>, <caption>

8. Form <form>, <input>, <textarea>, <select>, <option>

9. Others <br>, <hr>, <div>, <span>, <fieldset>, <legend>, etc.

HTML5 new elements

1. Structural elements <header>, <footer>, <section>, <article>, <aside>, <nav>

2. Functional elements <hgroup>: used to group titles <figure>: represents an independent piece of content <video>: defines video <audio>: defines audio <canvas>: represents graphics. It has no behavior itself, only provides a canvas <mark>: Highlight text <time>, <progress>, etc. <input> element type attribute value enhancement