HTML

I have added two HTML tips under the **Style** section.
> If all the <script> stay just before the </body>, they stay organized right with the non-async and non-defer <script> that should be down here anyway. Within this approach they can all stay at one place.

Using `async` at the bottom of the body has (almost?) no advantage over `defer`. There's no parsing to be blocked at this point anyway.

If maximum performance + keeping all of your scripts in one place are desired, I think `async` and `defer` are preferable. As you point out though, this will cause IE9 users to block. I'm not sure we should care, honestly.

> The benefits seems to be obvious.

Perhaps. I'm just not a fan of making a move in the guides until we've done our diligence on it.

I think what you propose lines up with what we've been doing, I just wonder if anyone has any hard and fast data comparing that approach with `async` and `defer`.