tristandunn/antiscroll — comment on commit fc7f95200e697784e662d3a3b903058a69c33205
File: index.html line 245
By tristandunn:

If neither attribute is present [async or defer], then the script is fetched and executed immediately, before the user agent continues parsing the page.
— 4.3 Scripting — HTML Standard

If this weren't the case then `$` wouldn't work in script blocks following jQuery.