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But Google what about mobile phones that do not support Javascript?

In the global device market, there are still between 0.2% and 5.4% of phones that do not support Javascript, at least in these set of countries according to this site.

In case your mobile website falls within this set than what do you do when you want to optimize CSS delivery by deferring the loading of some CSS but still serving the complete CSS to non-Javascript websites?

Deferring your CSS is when you basically load style-rules that are responsible for rendering content above-the-fold inline within the <head></head> section of your page. The rest of the CSS that is responsible for below-the-fold content you would load after. The problem is that the recommendation snippet given here by Google only takes Javascript enabled sites into consideration. So what if you have to take non-Javascript mobile devices as well into account and in doing so have the best of both worlds? Well, one way to achieve this is to add your CSS-link in a <noscript></noscript> tag before the closing </body> element, like so:

<noscript>
  <link rel="stylesheet" href="my-external-styles.css" type="text/css"/>
</noscript>

It’s that simple. That way you will make sure that the CSS-link only gets requested by the browser when Javascript is not supported and will not be requested twice. I’ve chosen to add the tag within the <body></body> tag to be backwards compliant with HTML 4.01 and HTML 5, see the spec here for more info.

Any questions, suggestions, remarks, drop a comment below!

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