<tr align = "center">

<table align="center">

Used to specify the URL address of the server program that receives and processes form data

Submit the form information to the xxx location page

Used to set the submission method of form data

get

post

Used to specify the name of the form to distinguish multiple forms on the same page

single line of text

Password box

single button

checkbox

image submission

file domain

submit

reset

Enhance user experience

Enter text content

Don’t forget to add the unit px

1. 14px is now commonly used in web pages.

2. Try to use even numbers and font sizes. Old browsers such as IE6 will have bugs when supporting odd numbers.

3. Various fonts must be separated by commas in English.

4. Chinese fonts need to be quoted in English, while English fonts generally do not need to be quoted. When you need to set an English font, the English font name must precede the Chinese font name.

5. If the font name contains symbols such as spaces, #, $, etc., the font must be enclosed in single quotes or double quotes in English, for example, font-family: "Times New Roman";.

6. Try to use the system default font to ensure that it can be displayed correctly in any user's browser.

7. Generally, multiple fonts will be written. If the browser does not support the first font, it will be pushed to the next one. If it does not support it, the default font will be used.

normal == 400

bold bold == 700

There is no need to have a unit for 400 or 700. It is recommended to use numbers instead of normal and bold.

normal normal

italic inclined

oblique is also italicized

Whether the font is italic, whether the font is bold, size/line height, font

#f00

#000

#fff

distance between rows

The unit generally uses px

It’s just a suggestion. The actual situation depends on the specific situation. The line spacing should be about 7.8 pixels larger than the font size.

font-style: normal

font-style:italic

font-weight: normal 400

font-weight: bold 700

text-decoration:none;

text-decoration:underline;

text-decoration:none;

text-decoration:line-through

You can select a certain type of tags, such as all div tags

div span table input

You can select one or more tags

.nav

Multiple class name selector

# Define id call

number of uses

For example, class is a person's name and can be repeated, but id is an ID number and is unique.

They are not mutually exclusive and can be mixed

* All tags will be selected and used less often during actual development.

Separate with spaces to select descendants

Separate with > Select biological son

Label concatenation div.one

div#two ==》 <div id = "two"></div>

It is used relatively rarely and is not recommended.

Use commas to separate collective declarations of the same style.

div, p ,span, .current { color: red;}

/* Unvisited links */

/* Visited links */

/* Move the mouse to the link */

/* selected link */

Only one can be placed in a line

no width and height

You can put multiple in one line

display: inline;

display: block;

display: inline-block;