What is the attribute with an underscore prefix in css

Editor to share with you what the attribute with an underlined prefix in css is, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

Underscore (_)

Applicable browser: IE6 and below

Versions of IE 6 and below can recognize an attribute with an underlined prefix, while readers will ignore it. Therefore, the hyphen of an attribute preceded by an underscore becomes a proprietary property of IE6 and the following versions of browsers.

# elem {width: [W3C Model Width]; _ width: [BorderBox Model];}

PS: this rift in the hack exercise reader uses useful CSS, so the application is not recommended.

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