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How to prevent line number from being copied to clipboard when displaying code in HTML

Altcademy Team wrote on 7 February 2018

https://stackoverflow.com/questions/32969120/how-to-prevent-part-of-html-text-from-being-copied-when-copying-adjacent
The solution is to use a pseudo element and not actually put the number in your element.
<span class="line-number" data-line-number="1"></span>

.line-number::before {
  content: attr(data-line-number);
}

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