I am trying to link to css file :
<link href="/semanticui/semantic.css" rel="stylesheet" />
Opening chrome in #development=1
mode to test my page for amp. I am getting this error :
The attribute 'href' in tag 'link rel=stylesheet for fonts' is set to the invalid value '/semanticui/semantic.css'.
External stylesheets are not permitted. Use inline styling to avoid the additional request for css.
More info can be found at: https://github.com/ampproject/amphtml/blob/master/spec/amp-html-format.md#stylesheets
Authors may add custom styles to a document using a single
<style amp-custom>
tag in the head of the document.