Is it wrong to place the script tag after the body tag

Question

How wrong is it to place the script tag after the closing tag of the body   lt  body gt        lt html gt            lt body gt               lt  body gt     lt script type  text javascript  src  theJs js  gt  lt  script gt   lt  html gt

User · Answer

Google actually recommends this in regards to 'CSS Optimization'. They recommend in-lining critical above-fold styles and deferring the rest(css file).

Example:

<html>
  <head>
    <style>
      .blue{color:blue;}
    </style>
    </head>
  <body>
    <div class="blue">
      Hello, world!
    </div>
  </body>
</html>
<noscript><link rel="stylesheet" href="small.css"></noscript>

See: https://developers.google.com/speed/docs/insights/OptimizeCSSDelivery

User · Answer

As Andy said the document will be not valid  but nevertheless the script will still be interpreted  See the snippet from WebKit for example    void HTMLParser  processCloseTag Token  t           Support for really broken html         we never close the body tag  since some stupid web pages close it before         the actual end of the doc         let s rely on the end   call to close things      if  t- gt tagName    htmlTag    t- gt tagName    bodyTag                                   t- gt tagName    commentAtom          return

User · Answer

Procedurally insert  element script  after  element body  is  parse error  by recommended process by W3C  In  Tree Construction  create error and run  tokenize again  to process that content  So it s like additional step  Only then can be runned  Script Execution  - see scheme process      Anything else  parse error   Switch the  insertion mode  to  in body  and reprocess the token    Technically by browser it s internal process  how they mark and optimize it   I hope I helped somebody

User · Answer

It won t validate outside of the  lt body gt  or  lt head gt  tags  It also won t make much difference  mdash  unless you re doing DOM manipulations that could break IE before the body element is fully loaded  mdash  to putting it just before the closing  lt  body gt     lt html gt            lt body gt                  lt script type  text javascript  src  theJs js  gt  lt  script gt     lt  body gt   lt  html gt

User · Answer

Yes  Only comments and the end tag for the html element are allowed after the end tag for the body   Browsers may perform error recovery  but you should never depend on that

User · Answer

IE doesn t allow this anymore  since Version 10  I believe  and will ignore such scripts  FF and Chrome still tolerate them  but there are chances that some day they will drop this as non-standard

User · Answer

Modern browsers will take script tags in the body like so    lt body gt       lt script src  scripts main js  gt  lt  script gt   lt  body gt    Basically  it means that the script will be loaded once the page has finished  which may be useful in certain cases  namely DOM manipulation   However  I highly recommend you take the same script and put it in the head tag with  defer   as it will give the same effect    lt head gt       lt script src  scripts main js  defer gt  lt  script gt   lt  head gt

User · Answer

Yes  But if you do add the code outside it most likely will not be the end of the world since most browsers will fix it  but it is still a bad practice to get into

[javascript] Is it wrong to place the <script> tag after the </body> tag?

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