AMP Error – boilerplate

This post solves the issue of amp boilerplate tags are malformed:

The mandatory text inside tag 'head > style[amp-boilerplate]' is missing or incorrect.

Cause was:

YUI compressor (PHP) for CSS in w3 total cache (instead of default minify compressor).


Change the compressor back to Minify (default), save settings and purge cache.


The boilerplate style in head section for amp page include should this code:

<style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>

If it doesn’t then google webmasters tools gives an error.

The YUI compressor was removing this code for some reason, resulting in empty boilerplate style tag.

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