Title tag: <h1></h1>--<h6></h6>

Paragraph tag: <p></p>

Line break tag:<br/>

Horizontal line tag: <hr/>

>:&gt;

<:&lt;

Copyright number: &copy;

Quotation marks: &quot;

Space: &nbsp;

img attribute

Starting from html file

../ Exit the previous directory

./ Current directory

The absolute path starts from the c drive

Set web page keywords

html is not case sensitive

Comments cannot be nested

The tag structure must be complete

Tags can be nested

tag if the attribute must have a value

Reference information from another page

iframe tag attributes

Use the a tag to jump to another page

Syntax: <a href="">Display text content</a>

a tag attribute

<a href="#id"><a id=value></a>

<a href="mailto:email address"></a>

strong: Make the content bold and emphasize the content

em: Italicize the content, emphasize the content

i: Content is shown in italics

b: The content is displayed in bold

small: the content becomes smaller

cite: indicates a bibliography, the content is italicized

q: Indicates a quote of a phrase, add double quotes to the content

blockquote: represents a long quote

sup: indicates superscript

sub: indicates subscript

del: add strikethrough

ins: add underline

pre: Make text formatting preserved

code: represents code, used with pre to display code blocks

By default, block-level elements will occupy one line of elements. Regardless of the content of the element, they will occupy the entire line.

Inline elements occupy their own size by default and will not occupy a single line.

unordered list

ordered list

definition list