Incompatible with IE8

<meta http-equiv="x-ua-compatible" content="ie=7" />

<Title> Add this sentence to use ie7 compatibility.

If the problem persists, use the HACK attribute.

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The float bug of ie (ie6, ie7) bothers front-end engineers. The most common phenomenon is that the border is missing when the parent element of the floating element is dragging the scroll bar, the solution to this problem is to make the floating element layout.

In many cases, the width of the page needs to be scaled freely, but the width cannot be declared as a fixed value. However, we can set * height: 1%;, * Here it can be said to be very light.
Because * can only be parsed by ie7 or earlier versions, ie8 does not recognize this type of writing, so you can use this method to distinguish ie8 from other versions of IE browser.
Beta1's hack is also a supplement.

Some common hack tests

* Html p {color: red;} supports IE6 and does not support FF IE7 IE8b.
* + Html p {color: red;} supports IE7 IE8b and does not support FF IE6
P {* color: red;} supports IE7 IE6 and does not support FF IE8b.

In IE8, the substring matching attribute selector (substring matching attribute selectors) is added in CSS3. The matching rules are similar to those in Regular Expressions:

E [att ^ = 'val'] // The substring starts with 'val'
E [att $ = 'val'] // The substring ends with 'val'
E [att * = 'val'] // The substring contains 'val'

IE8 supports the vast majority of basic CSS2.1 selectors, including but not limited to [: first-line] and [: first-letter].
For the generated content section in CSS2.1, that is, adding text content by using pseudo elements: before AND: after, IE8 does not support completely.
For opacity and RGBA supported in almost other browsers, IE8 still does not.
HACK originally used to distinguish IE is basically invalid in IE8 (for example, * property: value, * property: value, etc ).
The original list-item whitespace bug of IE still exists in IE8.
The original IE z-index bug still exists in IE8.
New bug in IE8: When line-heigth is smaller than normal, the excess parts will be dropped.
Display: table is still not supported in IE8.
In IE8, the border's transparent value is still not supported.
In IE8, @ import only supports layer-3 nesting.
Border's transparent in IE8 is not supported
New BUG in IE8: line-heigth BUG
/*/P {color: # 1e90ff}/*/Only hack for IE8, which can be an attribute or a class