Detailed explanation of rgba compatibility processing method-CSS Tutorial-php.cn

Detailed explanation of rgba compatibility processing method

高洛峰

Release： 2017-03-21 14:36:32

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According to caniuse (http://caniuse.com/#search=rgba), rgba compatibility is IE9 and above browsers.

Detailed explanation of rgba compatibility processing method

Instance code:

<!doctype html>
<html>

    <head>
        <meta charset="UTF-8" />
        <title>rgba 兼容性处理</title>
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }
            
            .parent {
                width: 400px;
                height: 400px;
                margin: 100px;
                font-size: 20px;
                color: #FF0000;
                border: 1px solid red;
                background-color: rgba(0, 0, 0, 0.5);
            }
        </style>
    </head>

    <body>
        <div>
            rgba
        </div>
    </body>

</html>

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Chrome browser effect:

Detailed explanation of rgba compatibility processing method

IE8 browser effect (no background):

Detailed explanation of rgba compatibility processing method

rgba compatibility processing:

.parent {
                width: 400px;
                height: 400px;
                margin: 100px;
                font-size: 20px;
                color: #FF0000;
                border: 1px solid red;
                background: rgba(0, 0, 0, 0.5);
                /*下一句关键设置*/
                filter: progid:DXImageTransform.Microsoft.gradient(startcolorstr=#7f000000, endcolorstr=#7f000000);
            }

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The purpose of setting the filter attribute is the previous line Executed when the transparency does not work, filter: progid:DXImageTransform.Microsoft.gradient is used to make gradients, but no gradient is needed here, so both colors are set to the same color.

This color "#7f000000" is composed of two parts.

The first part is 7f after #. Is the IEfilter value of rgba transparency 0.5. Each number from 0.1 to 0.9 corresponds to an IEfilter value. The corresponding relationship is as follows:

Detailed explanation of rgba compatibility processing method

#That is: the value obtained by alpha*255 can be converted into hexadecimal.

The second part is the six digits after 7f is a hexadecimal color value, which is the same as the value in the rgb function , such as rgb(255,255,255) #ffffff.

Summary: This has completed the RGBA compatibility processing for IE8 and the following IE browsers.

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