Is there any shortcut to add this>
<del>delete</del>
delete
<ins>insert</ins>
insert
for more: Discourse BBCode
3 Likes
And now:
<mark> mark </mark>
for yellow too
2 Likes
Brown on the default dark theme apparently! 
If you need more colors, you can wrap the text in spans like this:
<span data-theme-red>this text will be red</span>
And customize the color with CSS such as:
[data-theme-red] {
background-color: red;
}
You can see a live example here, where I set colors to highlight returned, broken or stolen unicycle parts on a wiki topic: Schlumpf hub serial numbers reference - Unicycles and Equipment - Unicyclist.com
3 Likes
I didn’t even consider the changes in a dark theme. I should’ve stuck with: 
<mark> mark </mark>
mark
Flipping to the air-dark theme on meta, the mark highlight is a lovely shade of lilac.
2 Likes