When the title of an application contains HTML elements, they are rendered as HTML in the plastik theme. This can greatly distort the application UI, as can be seen in the demo screen shots. I tested it using a simple website which has some HTML markup within the title tag: <title><h3><i>Hello</i> World<img src="http://[...]Feed-icon.svg.png" /><h3></title>. I used Firefox (25.0), Konqueror (4.10.5) and Opera (12.16). In each case the inputs were rendered a little different (changed size of the windows icons for Konqueror and Firefox, and the image was correctly displayed only in Firefox) but generally all of them rendered the HTML code. When changing the layout to Oxygen, the HTML code is displayed as is in the window title bar, which is the behavior I would be expecting.

Reproducible: Always

Steps to Reproduce:
1. Switch theme to Plastik
2. go to http://www.frog23.net/development/kde-title-bug.html or open the attached file
3. look at the window decoration
Actual Results:  
The HTML code is rendered

Expected Results:  
The HTML code should be displayed as plain text