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Add a note for preload asset #12179

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Aug 16, 2019
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Add a note for preload asset #12179

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11 changes: 11 additions & 0 deletions web_link.rst
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Expand Up @@ -66,6 +66,17 @@ If you reload the page, the perceived performance will improve because the
server responded with both the HTML page and the CSS file when the browser only
requested the HTML page.

.. note::

You can preload an asset by wrapping it with the ``preload()`` function

.. code-block:: html+twig

<head>
{# ... #}
<link rel="stylesheet" href="{{ preload(asset('build/app.css')) }}">
</head>

Additionally, according to `the Priority Hints specification`_, you can signal
the priority of the resource to download using the ``importance`` attribute:

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