Css condition annotation theory and practice source file

Source: Internet
Author: User

The browser's condition annotation theory is explained in the following example.


The following code is used to test the effect of the condition comment statement in Microsoft's IE browser.

<! -- [If IE]>
<H1> you are using IE <! [Endif] -->
<! -- [If IE 5]>
<H1> Version 5 <! [Endif] -->
<! -- [If IE 5.0]>
<H1> Version 5.0 <! [Endif] -->
<! -- [If IE 5.5]>
<H1> Version 5.5 <! [Endif] -->
<! -- [If IE 6]>
<H1> Version 6 <! [Endif] -->
<! -- [If IE 7]>
<H1> Version 7 <! [Endif] -->

The following code is a condition comment for running in a non-IE browser

<! -- [If! IE]> <! -->
<H1> you are not using Internet Explorer <! -- <! [Endif] -->
It eventually works in non-IE and special IE browsers
(Or use lte lt or gt gte to determine, for example:
<! -- [If lte IE 6]>
Information displayed in IE 6
<! [Endif] -->

<! -- [If IE 6]> <! -->
<H1> you are using Internet Explorer version 6 <br/>
Or a non-IE browser <! -- <! [Endif] -->

From: cssplay. co. uk/menu/conditional.html "target =" _ blank "> http://www.cssplay.co.uk/menu/conditional.html

The condition annotation mentioned above is to determine the browser type and then define what content is displayed under the browser.

This dropmenu (drop-down menu) model comes from cssplay, which is made after many researches and repeated tests by the author. I want to use this model to illustrate the principle of conditional annotation.

First look at a simple model

Below is the xhtm
<Div class = "menu">
<Li> <a class = "drop" href = "../menu/index.html"> DEMOS
<! -- [If IE 7]> <! -->
<! -- <! [Endif] -->
<! -- Display in IE7 </a> label -->
<Table> <tr> <td>
<Li> <a href = "../menu/zero_dollars.html" title = "The zero dollar ads page"> zero dollars advertising page </a> </li>
<Li> <a href = "../menu/embed.html" title = "Wrapping text around images"> wrapping text around images </a> </li>
<Li> <a href = "../menu/form.html" title = "Styling forms"> styled form </a> </li>
<Li> <a href = "../menu/nodots.html" title = "Removing active/focus borders"> active focus </a> </li>
<Li> <a class = "drop" href = ".. /menu/hover_click.html "title =" Hover/click with no active/focus borders "> hover/click with no borders </li>
<Li class = "upone"> <a href = "../menu/shadow_boxing.html" title = "Multi-position drop shadow"> shadow boxing </a> </li>
<Li> <a href = "../menu/old_master.html" title = "Image Map for detailed information"> image map for detailed information </a> </li>
<Li> <a href = "../menu/bodies.html" title = "fun with background images"> fun with background images </a> </li>
<Li> <a href = "../menu/fade_scroll.html" title = "fade-out scrolling"> fade scrolling </a> </li>
<Li> <a href = "../menu/em_images.html" title = "em size images compared"> em image sizes compared </a> </li>
</Td> </tr> </table>

<! -- [If lte IE 6]>
<! [Endif] -->
<! -- Display when IE6 </a> label -->

<Link rel = "stylesheet" media = "all" type = "text/css" href = "final_drop.css"/>
<! -- [If lte IE 6]>
<Link rel = "stylesheet" media = "all" type = "text/css" href = "final_drop_ie.css"/>
<! [Endif] -->


First, let's see how css is defined in non-ie.
. Menu ul li ul {
Display: none;
/* Specific to non IE browsers */
. Menu ul li: hover {
Color: # fff;
Background: # bd8d5e;
/* Define the mouse over style */
. Menu ul li: hover ul {
Display: block;
Position: absolute;
Top: 3em;
Margin-top: 1px;
Left: 0;
Width: 150px;

In non-IE mode, the ul contained in li is displayed when the mouse slides over, because these browsers support li: hover usage.

Css in IE
. Menu ul li a: hover {
Color: # fff;
Background: # bd8d5e;
/* Ul display included in li when the mouse slides */
. Menu ul li a: hover ul {
Display: block;
Position: absolute;
Top: 3em;
Left: 0;
Background: # fff;
Margin-top: 0;
Marg \ in-top: 1px;

The final_drop.css style of the inheritance class. When there is no mouse time, the ul contained by li is not displayed.
<! -- [If lte IE 6]>
<! [Endif] -->
So when the mouse slides over IE6, a: hover is used to display the ul content.
In IE7, li: hover shows the same effect.

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