Add option to specify header offset

[daun]

Add an option to offset the final scroll position by a specific amount. Can be either a static number or a function that calculates the offset on demand before each scroll.

new SwupScrollPlugin({
    // Number: fixed offset in px
    offset: 30,
    // Function: calculate offset before scrolling
    offset: () => document.querySelector('#header').offsetHeight
});

[afmarchetti]

cool stuff!

[gmrchk]

I was always against this option and was in favor of this approach instead, but over time I see, I'm the only one that thinks that. 😅 Let's merge it once we're done with the comments above. ☝️

[daun]

I was always against this option and was in favor of this approach instead, but over time I see, I'm the only one that thinks that. 😅

The CSS solution is definitely more elegant, but you have to remember to do that for every possible anchor on your page...

[daun]

I added the proposed changes and documentation on the element argument.

[gmrchk]

Published 1.1.0. Really nice work. 👍 I'll update the docs site.