Web page cutting and CSS considerations_html/css_WEB-ITnose

1. Web page cutting

1) Web page cutting types can be summarized as background (bg), list item symbols (li), pictures inserted in the content (pic), buttons ( btn), icons and other forms (ico).

2) It is recommended to combine the images loaded with CSS background into one image. This reduces requests to the server. This improves page loading speed.

3) Except for the large image at the head of the page, which is saved in JPG format, all other images must be in gif format

2. CSS related matters:

1) All xhtml codes are in lowercase.

2) Each tag must have a beginning and an end, and must have the correct level. If there is no end tag, add "/" after the tag. For example: ,

3) All attributes must be enclosed in quotation marks "".

4) The document type must be declared, and the misuse of document types is prohibited.

5) All < and & special symbols are represented by encoding.

6) Code indentation must be used correctly. Use tab (TAB key on the keyboard) when indenting. No indentation, random indentation, and the use of spaces for indentation are prohibited.

7) The width and height of the background image loaded by CSS must be predefined, and the path must be an absolute path to load directly from the visitor's computer cache to improve page loading speed.

8) The performance and structure should be completely separated as much as possible. The code does not involve performance elements, such as style, font, bgColor, border, and b.

9) The definitions from

to

should follow the principle from large to small, reflect the structure of the document, and facilitate search engine queries. Use inheritance, otherwise the personality definition will become invalid.

10) The abbreviation of Font is: style thickness size line height font (font:italic bold 12px/30px “simsun”).

11) Class and id selectors, id can only be used in the same page and cannot be applied repeatedly.

12) Comment on the layout and important sections of the page. For example:

13) Add alt tags to images to facilitate search engine queries.

14) All tags must be properly nested.

15) There are several regular problems that arise during the implementation of the page: 3 pixel bugs, double floating margins, and text overflow bugs. Using a reasonable layout as much as possible can avoid problems caused by different browsers. CSS hacks should be avoided as much as possible.

16) Use inheritance as rationally as possible. The advantage is that the code structure is clear, making it easier for other modifiers to identify the page structure and reducing repeated definitions of CSS code.

17) On websites, it often happens that users input a large number of characters and letters so that the text cannot wrap normally, destroying the layout. In this case, we must refer to the following styles: word-wrap:break-word; overflow :hidden; Of course, there must be a width attribute value.

18) If the text is too long, the ellipsis style will appear as follows:

white-space: nowrap; text-overflow:ellipsis; overflow:hidden;

19) A complete The form should include:

20) In addition to ul ol, we can also use dl dt dd combinations for list elements on the page.

21) Reasonable use of multiple style definitions can effectively increase the reusability of styles.

22) We need to be clear about which tags are block elements and inline elements. Generally we can divide css elements into block (block) and inline (inline). Familiarity with these element attributes will help us understand CSS in depth.

23) Follow the recommended Css attribute writing order:

Display attribute:

display || visibility
list-style : list-style-type || list- style-position || list-style-image
position
top || right || bottom || left
z-index
clear
float

its own attributes:

width
max-width || min-width
height
max-height || min-height
overflow || clip
margin : margin-top || margin-right || margin-bottom || margin-left
padding : padding-top || padding-right || padding-bottom || padding-left
outline : outline-color || outline-style | | outline-width
border
background : background-color || background-image || background-repeat || background-attachment || background-position

Text attributes:

color
font : font-style || font-variant || font-weight || font-size || line-height || font-family
font : caption | icon | menu | message-box | small-caption | status-bar
text-overflow
text-align
text-indent
line-height
white-space
vertical-align
cursor