I've set up a site and I must have some strange configurations, because ALL applied styles on the entire site are coming from inline tags in the header:

enter image description here

If you check the markup it comes from this element with a strange ID:

enter image description here

I have never seen anything like this in M2 yet.

How and why is this happening?

2 Answers 2


I believe this is for developer/debugging use only, once you are running with server-side compilation and in production mode you should no longer see them.

This is a screenshot from a production website we have:

enter image description here

  • 1
    I'll second that, production mode you'll no longer see it.
    – andy jones
    Oct 12, 2017 at 17:51

Maybe you used custom js such as LeaVerou prefixfree, that convert link stylesheet tag to style tag. This was what happened to me.

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