Use defer attribute on all script tags, remove inline JS #1108
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I'm deploying the experimental `Feature-Policy` on my site. I tried disabling the `sync-script` policy, which blocks HTML-parse-blocking JavaScript, and django-debug-toolbar broke because its script tags aren't async or deferred. There's a bit more information about this feature, and a demo at https://feature-policy-demos.appspot.com/sync-script.html?on I've added `defer` to all the `<script>` tags, which makes them execute after HTML parsing has finished, in order. There was also one inline script for redirects which I've extracted - this would break for `sync-script` but also for use of `Content-Security-Policy` blocking inline JavaScript, which has been supported since django-commons#704 but it seems this was missed. Tested by using the `example` app, redirect interception worked and every panel loaded and looked right.
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@graingert you added CSP and like security features, perhaps you'd like to check this? |
graingert
suggested changes
Oct 25, 2018
| @@ -0,0 +1,3 @@ | |||
| document.addEventListener('DOMContentLoaded', function () { | |||
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This should be redundant with defer
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Idk how far back django-debug-toolbar tries to support, but ancient browsers don't support defer, so best to leave it here?
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https://caniuse.com/#feat=script-defer goes back to IE6
Also the script tag is below the element so even if it fell back to sync it would work
graingert
suggested changes
Oct 25, 2018
| @@ -0,0 +1,3 @@ | |||
| document.addEventListener('DOMContentLoaded', function () { | |||
| document.getElementById('redirect_to').focus(); | |||
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This is focussing a link not a form element :(
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Thanks! |
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No worries, thanks for active maintenance! |
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I'm deploying the experimental
Feature-Policyon my site. I tried disabling thesync-scriptpolicy, which blocks HTML-parse-blocking JavaScript, and django-debug-toolbar broke because its script tags aren't async or deferred.There's a bit more information about this feature, and a demo at https://feature-policy-demos.appspot.com/sync-script.html?on
I've added
deferto all the<script>tags, which makes them execute after HTML parsing has finished, in order. There was also one inline script for redirects which I've extracted - this would break forsync-scriptbut also for use ofContent-Security-Policyblocking inline JavaScript, which has been supported since #704 but it seems this was missed.Tested by using the
exampleapp, redirect interception worked and every panel loaded and looked right.