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Adding details about "defer" and legacy jquery #15280

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15 changes: 15 additions & 0 deletions frontend/encore/legacy-applications.rst
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Expand Up @@ -87,3 +87,18 @@ The ``global`` variable is a special way of setting things in the ``window``
variable. In a web context, using ``global`` and ``window`` are equivalent,
except that ``window.jQuery`` won't work when using ``autoProvidejQuery()``.
In other words, use ``global``.

Additionally, be sure to set the ``script_attributes.defer`` option to ``false``
in your ``webpack_encore.yaml`` file:

.. code-block:: yaml

# config/packages/webpack_encore.yaml
webpack_encore:
script_attributes:
defer: false

This will make sure there is *not* a ``defer`` attribute on your ``script``
tags. For more information, see `Moving <script> inside <head> and the "defer" Attribute`_

.. _`Moving <script> inside <head> and the "defer" Attribute`: https://symfony.com/blog/moving-script-inside-head-and-the-defer-attribute