Attribute value

HTML5 attribute value does not need quotation marks.

We recommend using quotation marks for attribute values:

If the attribute value contains spaces, you need to use quotation marks.

Mixing styles is not recommended, it is recommended to unify the style.

Use quotation marks for attribute values to make them easier to read.

Picture attributes

Pictures usually use the alt attribute. When the picture cannot be displayed, it can replace the picture display.

Define the size of the image and you can load it Reserve designated space to reduce flickering.

space You can use spaces before and after the equal sign

.

But we recommend using less spaces:

Avoid a line of code that is too long

When using the HTML editor, it is inconvenient to scroll the code left and right.

Try to keep each line of code to less than 80 characters.

Blank lines and indentation

Don’t add blank lines for no reason.

Add blank lines to each logical function block to make it easier to read.

Use two spaces for indentation, and TAB is not recommended.

Do not use unnecessary blank lines or indentation between shorter codes.

php Chinese website

php Chinese website, what you learn is not only technology, but also dreams.
php中文网, what you learn is not only technology, but also dreams.
php中文网, what you learn is not only technology, but also dreams.
php中文网, what you learn is not only technology, but also dreams.

##Form example:

< ;tr>
; ;B
;

Name	Description
Description of B

List instance:

1. London
2. Paris
3. Tokyo

#Omit and ?

In standard HTML5, < The html> and tags can be omitted.

The following HTML5 document is correct:

This is a title

This is a paragraph.

Omitting the and tags is not recommended.

##Omit?

In standard HTML5, The tag can be omitted.

By default, the browser will add the content before to a default element.

Omitting the head tag is not recommended.

##Metadata

The

The title and language can allow search engines to quickly understand the theme of your page:

< ;title>php Chinese website

##HTML comments

Comments are OK Written in :

Longer comments can be written in In the middle branch, write:

The first character of long comments is indented by two spaces to make it easier to read.

Style sheet

The style sheet uses a concise syntax format (the type attribute is not required):

Short rules can be written in one line:

p.into {font-family: Verdana; font-size: 16em;}

Long rules can be written in multiple lines:

body {
background-color: lightgrey;
font-family: "Arial Black", Helvetica, sans- serif;
font-size: 16em;
color: black;
}

Put the opening curly brace on the same line as the selector.

Add a space between the left curly brace and the selector.

Use two spaces for indentation.

Add a space between the colon and the attribute value.

Use a space after commas and symbols.

Use a symbol at the end of each attribute and value.

Use quotes only if the attribute value contains spaces.

The right curly brace is placed on a new line.

Maximum 80 characters per line.

A common rule is to add spaces after commas and semicolons.

Load JavaScript in HTML

Use concise syntax to load external Script file (type attribute is not required):

Example link





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