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Disabling Diazo creates invalid HTML (self-closing script tags) #159

scy opened this issue May 8, 2019 · 1 comment


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commented May 8, 2019

Not quite sure whether this is the right component, feel free to direct me to somewhere else.

In 5.2rc3, when I disable Diazo (to see the "vanilla" HTML), the <script> tags in the <head> are rendered as self-closing, i.e. <script src="…" /> instead of <script src="…"></script>. Since self-closing <script> tags are invalid, the browser ignores the closing / and thus starts interpreting everything following the first <script> tag as its contents. All of the <body> gets eaten by it and a white page is displayed.

To reproduce, use a buildout.cfg like this to install a simple Plone site:

extends =
parts =

recipe = plone.recipe.zope2instance
user = admin:admin
http-address = 9080
eggs =

Run bin/instance fg, then log in using admin:admin at localhost:9080. Create the default site. Then log out again, and make sure you're also logged out of HTTP Basic auth.

Now, you can either try accessing http://localhost:9080/Plone/? or, using the "hosts without theming" feature, open In both cases, you will end up with something like this:

screenshot of invalid HTML

Firefox 66, Chrome 74 and Edge 44 (I'm thorough…) all interpret the <script … /> tag as never being closed and don't display any content.

Funny enough, once you're logged in and the edit bar is displayed, you can access http://localhost:9080/Plone/? and it will output correct <script …></script> tags instead.

I've also tried using 5.2rc2 and 5.2rc1 (simply replace 5.2rc3-pending in the buildout.cfg with 5.2rc2 or 5.2rc and rebuild), both show the same result.

Edit: Forgot to mention, I'm running Python 3.7. My complete Version Overview:

  • Plone 5.2rc3 (5204)
  • CMF 2.4.0b8
  • Zope 4.0b10
  • Python 3.7.3rc1 (default, Mar 13 2019, 11:01:15) [GCC 8.3.0]
  • PIL 6.0.0 (Pillow)
  • WSGI: On
  • Server: waitress 1.2.1

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commented May 15, 2019

Commit introduced this issue:

scy referenced this issue in plone/Products.CMFPlone May 15, 2019

Add async and defer attributes to bundles
Add ``load_async`` and ``load_defer`` attributes to resource registries bundle settings.
When set, ``<script>`` tags are rendered with ``async="async"`` resp. ``defer="defer"`` attributes.
In production mode, the setting from the ``plone`` resp. ``plone-logged-in`` bundles are used for the ``default`` resp. ``logged-in`` meta bundles (``merge_with`` setting).
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