HTML Basics (1)

Html+css

Html:hypertext Markup Language Hypertext Markup Language definition document structure

Css:cascading style Sheets Cascading style sheets define style type (appearance)

页面表示基础、可以控制布局、控制页面渲染

HTML terminology

Comments

Used to describe (description) the code functionality. The browser does not parse and display

Elements:

构成网页的基础单位。网页由大量的元素组成。

Element composition:

<开始标签>元素内容</结束标签>属性是对元素附加的功能。

Element categories: Double label and single label

Element nesting: Parent element, child element, sibling element, descendant element

Document Declaration DOCTYPE

Not declared will be parsed with a lower version of the HTML protocol. Also called weird mode.

HTML Lang Property

Head header tag to depict additional information about a Web page

• Meta tags are used to mark other source data (charset, keywords, viewport, author)
• Link tag for connecting to other files (CSS)
• The script tag is used to connect other files (CSS) or embedded JavaScript in the head.
• The style label is used to write the head style.
• Title Tag page header.

BODY element

Page body is the page display content

CSS Reference classification

1. Internal style
   The style tag in head that writes CSS styles directly to the HTML header
2. External styles
   Write CSS in a separate CSS file, referencing it with the link tag
3. inline style
   Written in the tag's Start tab for individual label modification styles

It is recommended to use external styles to facilitate reuse and maintenance

Weight: The maximum in-line style weights, and the position in the head determines the weights of the inner and outer styles

Terms

1. Comments
   Features to describe the code

       /* 注释 */

2. Rules
   1. Selector Selector
      1. Element selector: Application of the same element
      2. Class selector: All matching classes are applied
      3. ID Selector: Uniquely matched element applied
   2. Naming rules:

HTML semantics

html5中新增的元素，与div相同的作用 但是能直接体现出意义

HTML Semantic structured elements

• Header Head
• Nav Navigation
• aside sidebar
• Ariticle Articles
• Section A whole or a part
• Footer Bottom

HTML elements

Element a

链接标签属性：href url  

• Jump to a new page
• Anchor Point function
• function link (tel, mailto), invoking the functions implemented by the system software.

HTML Basics (1)