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<a href="https://github.com/zopefoundation/Zope/commit/<a class=hub.com/zopefoundation/Zope/commit/eeb675c42f5e77a77e512745ba299bc42b6d5af4">eeb675c42<a href="https://github.com/zopefoundation/Zope/commit/eeb675c42f5e77a77e512745ba299bc42b6d5af4">&quot;&gt;Restore &amp;quot;attrs&amp;quot; template variable support (#861)

* fix lost &amp;quot;attrs&amp;quot; variable

* provide `CHANGES.rst` entries

* fix `isort` problem

* fix typo

* tentatively remove workarounds for `https://github.com/malthe/chameleon/issues/323`

* Revert &amp;quot;tentatively remove workarounds for `https://github.com/malthe/chameleon/issues/323`&quot;

This reverts commit </a><a class="double-link" href="https://github.com/zopefoundation/Zope/commit/<a class="double-link" href="https://github.com/zopefoundation/Zope/commit/5f492756bbf97a1514a4e47c62709d949bc96ba1">5f492756b</a>">5f492756b</a><a href="https://github.com/zopefoundation/Zope/commit/eeb675c42f5e77a77e512745ba299bc42b6d5af4">.

At least for the moment, `chameleon` is not yet ready to drop the work around.
In addition, our test suite is not sufficiently complete to verify the safety
of all `chameleon` features without the work around in place.

* clearly state in the comments related to `chameleon` work arounds that those might go away with ``chameleon &gt; 3.8.0``;
add a not to the Zope Book that ``chameleon`` implements `attrs` and `default` in a special way and that their value should not be changed

* add test for `CONTEXTS`; restore `CONTEXTS` related documentation (improved)

Co-authored-by: Jens Vagelpohl <jens@netz.ooo>

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