The control doesn't work in Safari
When placed in a horizontal PanelBar, the HtmlPlaceholder is not rendered.
The HtmlPlaceholde does not respect the applied Scale Transformations.
When placed in scrollviewer and browser is resized in order to appear the scrollbar, HTMLPlaceHodler doesn`t render correctly. The issue can be reproduced in both scenarios - setting the HtmlSource or SourceUrl property.
Make it easier to use the HtmlPlaceholder w/ scripts. Much like the WebBrowser control API.