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[AssetMapper] Adding CSP details, recommendingscript-src 'strict-dynamic'#21356

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8 changes: 6 additions & 2 deletionsfrontend/asset_mapper.rst
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Expand Up@@ -476,10 +476,14 @@ the page as ``link`` tags in the order they were imported.
.. note::

Importing a CSS file is *not* something that is natively supported by
JavaScript modules. AssetMapper makes this work by adding a special importmap
entry for each CSS file. These special entries are valid, but do nothing.
JavaScript modules. AssetMapper makes this work by adding an empty importmap
entry for each CSS file, e.g. ``"/assets/app.css": "data:application/javascript,",``.
These special entries are valid, but do nothing.
AssetMapper adds a ``<link>`` tag for each CSS file, but when JavaScript
executes the ``import`` statement, nothing additional happens.
When using a **Content-Security-Policy** with ``script-src 'self'``, this
will trigger an error because of the ``data:`` URL. You can either just
ignore the error, or lower the rule to ``script-src 'strict-dynamic'``.
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CopilotAISep 9, 2025

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[nitpick] The phrase 'lower the rule' is unclear and potentially confusing. Using 'strict-dynamic' is not necessarily 'lowering' security - it's a different security model. Consider rephrasing to 'change the rule to' or 'use' instead of 'lower the rule to'.

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ignore the error, orlower the rule to ``script-src 'strict-dynamic'``.
ignore the error, orchange the rule to ``script-src 'strict-dynamic'``.

Copilot uses AI. Check for mistakes.

.. _asset-mapper-3rd-party-css:

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