Example sizes:
- 300x250 mobile
- 320x480 mobile
- 300x250 desktop
- 336x280 desktop
- 970x250 desktop
- 300x600 desktop
- Low-aspect fullscreen mobile
- High-aspect fullscreen mobile

How to use query parameters:
- w = ad width in pixels, default 300
- h = ad height in pixels, default 250
- env = tst, stg or prod, default tst
- d = load as desktop, default mobile
- i = load as interstitial, default infeed
- r = creative is responsive, default not responsive
- cta = global cta, default CTACLICK
- onlytag = show this description: no, default yes
- scroll = adds [scroll amount * 100] px before and after ad,
            default 1000px of scroll
- e = any event name that will be used as 3rd party pixel.
            Simply adds data-onevent-[*]="myPixel" to the tag.
            Can be multiple events separated by comma(s).
- data-* = any data attribute