cite
指向资源的URL，用于解释删除或插入内容的原因。
datetime
删除或插入的日期。
<del
cite="https://bugzilla.mozilla.org/show_bug.cgi?id=1620467"
datetime="2020-07-23"
>Firefox doesn't support CSS's standard <code>appearance</code> property, so you can only use it prefixed.</del>
<ins
cite="https://bugzilla.mozilla.org/show_bug.cgi?id=1620467"
datetime="2020-07-23"
>The <code>appearance</code> property, previously only available prefixed in Firefox, can now be used in all modern browers unprefixed.</ins>
