div + css design How to make your web page compatible with various browsers_html/css_WEB-ITnose

It is a commonplace issue that CSS is compatible with various browsers. There are tutorials all over the Internet. The following content is not too novel and is purely a personal summary. I hope it will be helpful to beginners.

1. CSS HACK
The following two methods can solve almost all HACKs today.

1, !important

With IE7’s support for !important, the !important method now HACK only for IE6. (Pay attention to the writing. Remember that the declaration position needs to be in advance.)

2, IE6/IE77 for FireFox

* html and *html are IE-specific tags, which are not supported by Firefox. And *html is a IE7-specific tag.

Note:
* html HACK for IE7 must ensure the following statement at the top of the HTML:
"http://www.w3.org/TR/html4/loose.dtd">

2. Universal float closure (very important!)

For the principle of clear float, please refer to [How To Clear Floats Without Structural Markup]
Add the following code to Global CSS and add class="clearfix" to the div that needs to be closed. It works every time.

3. Other compatibility techniques (again? Whoops)

1. Setting padding on a div under FF will cause the width and height to increase, but IE will not. (can be solved with !important)
2. Centering problem.
1). Vertically centered. Set line-height to the same height as the current div, and then pass vertical-align: middle. (Be careful not to wrap the content.)
2). Horizontally centered. margin: 0 auto; (of course not universal)
3, if you need to add styles to the content in the a tag, you need to set display: block; (common in navigation tags)
4, FF and IE understand BOX The difference that causes the difference of 2px is also the problem that the margin of the div set to float is doubled under IE.
5. The ul tag has list-style and padding by default under FF. It is best to declare it in advance to avoid unnecessary trouble. (Common in navigation tags and content lists)
6. Do not set the height of the div as an external wrapper. It is best to add overflow: hidden. to achieve height adaptability.
7. Regarding the hand cursor. cursor: pointer. And hand is only applicable to IE.

P.S As for IE5 and other browsers, there is no need to take care of it. It is not worth spending time on this.