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[UPGRADE] Mention the CSS strategy and it's effects #14666

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[UPGRADE] Mention the CSS strategy and it's effects #14666

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e1440f6
Mention about CSS strategy
wouterj May 17, 2015
0bf8096
Fix typo
wouterj May 17, 2015
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30 changes: 30 additions & 0 deletions UPGRADE-2.7.md
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Expand Up @@ -534,3 +534,33 @@ Validator
* The PHP7-incompatible constraints (Null, True, False) and related validators
(NullValidator, TrueValidator, FalseValidator) are marked as deprecated
in favor of their `Is`-prefixed equivalent.

TwigBundle
----------

* The `Symfony\Bundle\TwigBundle\TwigDefaultEscapingStrategy` is deprecated and no longer
used in favor of `Twig_FileExtensionEscapingStrategy`. This means that CSS files automatically
use the CSS escape strategy. This can cause different behaviour when outputting reserved
characters.

Before:

```css
{# styles.css.twig #}

{# with brand_color: '#123456' #}
body {
background: {{ brand_color }};
}
```

After:

```css
{# styles.css.twig #}

{# with brand_color: '#123456' #}
body {
background: {{ brand_color|raw }};
}
```