script tag doesn't get evaluated when running vanilla JavaScript

[nikolalsvk]

If user doesn't have jQuery on the page, render_async fetches request using plain JavaScript.

Problem with this is that <script> tags don't get executed when appended to HTML.

Problem is with outerHTML not being able to run script tags.

Useful links:

• Gotchas with dynamically adding script tags to HTML
• jQuery's replaceWith method implementation