YouTube iframe embed not starting in HD

Question

I\'m trying to embed an HD YouTube video but no matter what I try, it only ever seems to load the 480p version.

According to YouTube, embedding an HD video is as sim

Answer 1

I use &hd=1&vq=hd720 for achieve that. It loads the 720p version even if the player is smaller. I got this information from this source.

Answer 2

Use this parameter:

vq=hd1080

Example:

<iframe src="https://www.youtube-nocookie.com/embed/SzTdgE04uA8?vq=hd1080" width="853" height="480"></iframe>