h1:after {content:url(/i/w3school_logo_white.gif)}
a:after
content: " (" attr(href) ")"
}
h1:after {content:url(/i/w3school_logo_white.gif)}
a:after
content: " (" attr(href) ")"
}
本文标题：content属性（每个链接后插入 href
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