Single label: hr

Double tag:p

html: the entire web page

head: Web page header

title: Web page title

body: web page theme, you can type directly inside

Constellation

Nested relationship

anywhere on this line,

Features: Exclusive line, bold, font size gradually becomes smaller, 6

H1 pages are generally used only once in a web page. Used to put news titles or web page names

Exclusive line, gaps between paragraphs, adaptive layout

alt (replacement text): text displayed when the image cannot be displayed

title (prompt text): the text displayed when the mouse hovers

width

height

Browsers scale images to equal proportions by default

Category: relative path, absolute path

Relative path (commonly used)

absolute path

src

controls

loop

autoplay

controls

src

loop

muted

autoplay

orderly

disorder

definition list

table: table

tr: OK

th: header cell

td: content cell

table nests tr, and each tr nests th or td

thead

tbody

tfoot

Classify the contents of the entire table for future Css modifications

Merge horizontal and vertical cells into a grid, spanning rows and columns

Merge steps

<input type="....">, different types have different functions

input tag placeholder text

select nested option, the selected attribute is set to default

Enter text in multiple lines

<textarea>Prompt text</textarea>

There is a corner in the lower right corner

Use it to bind the relationship between text and form controls to increase the click range of the form controls.

Both ways of writing

text, password, file, radio, checkbox, select, textarea all support increasing the click range

<button type=""></button>The default is submit when type is omitted

type attribute value

Used to lay out web pages

div (big box): exclusive line

span (small box): no line breaks

Space: &nbsp;

Less than sign: &lt;

Greater than sign:&gt;