title tag

paragraph mark

horizontal line mark

newline mark

<b></b> and <strong></strong> text is displayed in bold (b defines bold text, strong defines emphasized text)

<img src=”Image URL”/>

alt replacement text when the image cannot be displayed

<a href="Jump target" target="How the target window pops up">Text or image</a> target _self is the default value, which means opening in the original window, _blank means opening in a new window

Anchor link <a href="#id name">Link text</a>

<ul> Unordered list <li>List item 1</li> (<ul></ul> can only be nested <li> </li>)

<ol> Ordered list <li>List item 1</li> Change the starting value of list numbering <ol start="2">

dl element is often used to explain and describe terms or nouns <dl> <dt>Noun 1</dt> <dd>Explanation of noun 1<dd>

header element

nav element

details element and summary element

inline

Embedded

Link-in

tag selector

class selector

ID selector

wildcard selector

Union selector

font-size: font size

font-family: font

font-weight: font thickness

font-style: font style

coler: text color

line-height line spacing

text-decoration text decoration

text-align: horizontal alignment mode

taxt-indent: first line indent

<from action="url address" method="submission method (post)" name="form name"> Various form controls </from>

Single line text input box ,<input type="text">

Password input box <input type="password">

single button <input type="radio">

checkbox <input type="checkbox">

submit button <input type="submit">

reset button <input type="reset">

<select> <option>Options</option> <option>option</option> <select>

The float attribute of the element float left element floats to the left right element floats to the right none element does not float

Position: attribute value static static positioning relative relative positioning absolute absolute positioning fixed fixed positioning

The <span> tag can only contain text and various inline tags

<div> can replace block-level elements

The space between <div> and </div> is equivalent to a box. You can set the margins, padding, width and height. At the same time, it can accommodate various network elements such as paragraphs, titles, tables, images, etc.

Border properties

Margin properties

background properties

To insert content before the content of the selected element, the content must be specified with the content attribute. <element>: before { Content: text; }

a: link{css style rule;} The status of the unvisited hyperlink

a: visited{css style rules;} The status of the hyperlink after visiting

a: hover {css style rule;} The state of the hyperlink when the mouse passes or hovers

a: active {css style rule;} The state of the hyperlink when the mouse is not moving