header.php

<meta charset="utf-8">
<script async src="https://cdn.ampproject.org/v0.js"></script>
<script async custom-element="amp-form" src="https://cdn.ampproject.org/v0/amp-form-0.1.js"></script>
<script async custom-element="amp-video" src="https://cdn.ampproject.org/v0/amp-video-0.1.js"></script>
<script async custom-element="amp-audio" src="https://cdn.ampproject.org/v0/amp-audio-0.1.js"></script>
<script async custom-element="amp-animation" src="https://cdn.ampproject.org/v0/amp-animation-0.1.js"></script> 
<script async custom-element="amp-position-observer" src="https://cdn.ampproject.org/v0/amp-position-observer-0.1.js"></script>
<link rel="canonical" href="<?php echo home_url($_SERVER['REQUEST_URI']) ?>">
<?php wp_head(); ?>
<?php
    if ($icon = wp_get_attachment_url(get_theme_mod('favicon'))) {
        echo '<link rel="shortcut icon" href="'.$icon.'">';
    }
?>
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<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>
<?php
echo get_theme_mod('header_js', '');
?>