The document includes code snippets for CSS styling, PHP includes, Gulp tasks to remove '!important' and charset declarations from CSS, and JavaScript for Google Analytics tracking on AMP pages using amp-analytics tags.

8.
<style amp-custom>
body { color: #333; … }
</style>

9. <style amp-custom>
<?php
include “css/amp.css";
?>
</style>

10. var replace = require('gulp-replace');
gulp.task('sass', function () {
…
.pipe(replace('!important',''))
.pipe(replace('@charset "UTF-8";n',''))
@charset “UTF-8"style.scss

12. <script async custom-element=“amp-analytics” src=“https://cdn.ampproject.org/
v0/amp-analytics-0.1.js”></script>
…
<amp-analytics type=“googleanalytics” id=“analytics1”>
<script type=“application/json">
{
“vars": {
"account": “xxxxxxxxx（トラッキングID）"
},
“triggers": {
“trackPageview": {
“on": “visible",
“request": “pageview"
}
}