To write abbreviations, use the acronym abbr HTML element.
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# del
Defines text that has been deleted.
Example: Copy
cite
Defines the URL where the reason for the deletion is explained.
"https://developer.mozilla.org/en-US/docs/Web/HTML/Element/acronym"
You can only use a valid URL.
datettime
Defines when the deletion has occured.
"2017-10-14T12:00:00.001-04:00"
You need a valid datettime string.