These articles make it look like they are:
- https://support.google.com/webmasters/answer/6101188?hl=en
- https://developers.google.com/web/fundamentals/layouts/rwd-fundamentals/set-the-viewport
This is an example of what would be a penalized viewport (fixed width):
<meta name="viewport" content="width=400, initial-scale=0.75">
This would not be penalized:
<meta name="viewport" content="width=device-width, initial-scale=0.75">
The reason seems to be that the fixed width version is considered bad for mobile usability.
Considering that I have verified with lots of testing that the fixed-width version works better cross-browser when combined with javascript code to update the viewport size, I believe this issue is of major importance.
So, am I correct? Is the fixed width version going to be penalized?