Backport 65d130f

Mention the quotes requirement in the docs too
twbs · Sep 16, 2020 · a27617d · a27617d
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diff --git a/site/docs/4.5/getting-started/theming.md b/site/docs/4.5/getting-started/theming.md
@@ -225,7 +225,7 @@ You can also specify a base color with our color map functions:
 
 #### Escape SVG
 
-We use the `escape-svg` function to escape the `<`, `>` and `#` characters for SVG background images. These characters need to be escaped to properly render the background images in IE.
+We use the `escape-svg` function to escape the `<`, `>` and `#` characters for SVG background images. These characters need to be escaped to properly render the background images in IE. When using the `escape-svg` function, data URIs must be quoted.
 
 #### Add and Subtract functions