Ang their products are awesome.

Have a look at SiriWaveJS. I guess the source code might help you to understand how things are going here.

http://codepen.io/kopiro/details/yfegd

Absolutely in love with the typefaces you're using here. Is this site already live?

Yes, your solution is actually nicer for long paragraphs. :)

I'd use the :after selector, which is very useful and let you keep a clean HTML.

Example: http://codepen.io/anon/pen/MwePJp

Hello DN,

We recently have launched our new portfolio and we're always looking for feedback. Let me know what you think!

Thank you in advance.

Damn, didn't know about that. Thanks for sharing this!

This could be done with SVG filters, see:

http://codepen.io/andreasstorm/pen/FbBdy

&

http://caniuse.com/#feat=svg-filters

Cool website. I really like the contact page transition!

Good job :)

I totally agree with you.

But:

I'm quite okay with that – there's a lot of website "containing" the scroll and pushing the offset to a certain value.

In this example, it's just a way to make a smooth -parallax- scroll. Although I don't see any real "scroll hijacking" in this page : the scroll is the same. There's a scrollbar. The only thing that has been hijacked is the scroll speed, because of a easing function. That's all.

Here's an example of a bad scroll hijacking.