Exclude scripts with attributes async and defer

[ste101]

To limit the preload scripts it would be nice to exclude scripts with the attributes async and defer.

[bmack]

Sounds like a good idea! Would you be willing to create a Pull request for this?

[ste101]

Is http2/Classes/ResourcePusher.php still necessary or could this be remove because it is for <12.4?

[ste101]

I wasn't able to find a way because my regex knowledge is not good enough.