Take a page like https://en.wikipedia.org/wiki/Heliozela_rutilella?veaction=edit (that is, starting with a template, so there's some space above the first line of the article).
Clicking on the link tool and pressing ESC will automatically make the first word (Heliozela) a link to the Heliozela article.
Click on the up arrow, then click on the link tool again, and press ESC. You get the word Heliozela again (with no links).
See Also:
T70101