<head>
When fullPage.allowRenderStylesFromHead is set to
true styles from <head> are rendered.
With this option on we recommend to use a CSS sanitizer function to increase the security.
In this manual test sanitizer function is added and it simply removes
color: green; from stylesheet; This property is initially added to the
h2 but as you can see the headline is not green but black (default
color). When you click the Source button, you will see that style that
is set to the h2 remains the same. Sanitizer function only works during
rendering the style on page while editing it in the editor. It does not affect the
source style.