It creates ID for your headers, and attach a hover anchor to them. ABSOLUTE development laziness, I love that.
Bonus: just adding the AnchorJS library + the JS snippet to your site will just work as fine!
The default “read more…” link in WordPress is quite boring… and often, so-called theme developers just neglect it and leave it as is. Stuck on the left, no margin, no effects, barely noticeable, plain boring.
What about an awesome Fade Out effect instead? You can always find codepens and jsfiddles here and there but they have to be adapted for WordPress and you don’t have time to spend on this task. Search no more!