force display of <noscript> content

[Yuchen Pei]

Hello,

Currently, librejs filters all html and js requests / responses, and
accepts / edits / rejects accordingly.  It forces the display of
<noscript> element content only when an inline script / event handler
etc on an html has been modified.  This can cause problems when librejs
leaves html unmodified, but blocks some external scripts.  An example is
certain versions of discourse forums, like [0][1] and sometimes the fsf
member forum, with librejs the browser may display a blank / broken
page, but they render fine in browsers not supporting javascript like
eww and lynx.

[0] https://discourse.haskell.org/
[1] https://emacs-china.org/

I was thinking about what to do with this.  I can think of a few options

1. Add a button to allow the user to manually force noscript display
   until the next (re)load.  This is what I have done in [2].

2. Add a more persistent user option, which when enabled, make librejs
   reject all scripts when a noscript tag is present.

3. Something in between: a per-site / url option to force noscript
   display.

[2]
https://git.savannah.gnu.org/cgit/librejs.git/commit/?h=noscript-toggle&id=b849b8d461479cf6530c77b97b094807840ce0d7

A few relevant questions:

1. Do developers ever sneak scripts between <noscript> tags?

2. Does it make sense to reject all scripts, free or nonfree, when
   opting for noscript display, assuming sites generally use <noscript>
   to offer a version when *all* scripts are blocked?  Otherwise there
   may be duplicate content on a web page if some scripts are accepted
   and <noscript> content is displayed.

Best,
Yuchen

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