7.9.8 base.text.ins Inserted text
The <ins> element indicates additions to the document.
Example
This line of text is meant to be treated as an addition to the
document.
Markup: base/text/text-ins.twig
<ins class="{{modifier_class}}">This line of text is meant to be treated as an addition to the
document.</ins>
Source:
base/text/_text.scss, line 135