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  1. Please find below the Javascript insertion <script> tag that Matomo uses to track user behavior on a webpage. <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//{$PIWIK_URL}/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', {$IDSITE}]); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s); })(); </script> <!-- End Matomo Code --> I would like to clarify the meaning of the final line of the above function -- namely, g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s); QUESTION ONE: Can the script attributes async and defer work indepedently of each another? What is the purpose of each and does their role change when they are imlpemented together? QUESTION TWO: Given the statement s=d.getElementsByTagName('script')[0]; does the statement s.parentNode.insertBefore(g,s); read: "Find the parent node of s and prepend g before s where s is the first node of all script nodes within the document including the node containing this function"?
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