Here are the steps to replicate this problem:
- Go to Extensions > MicroTiny WYSIWYG Editor > Settings
- In the CSS Styles field, enter the follow or something similar:
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mystyle=mystyle1
mystyle1=mystyle2
mystyle2=blah
- Highlight a word or two and apply the first style ("mystyle" in my example above).
- Now view the HTML and you will see that the class name has a comma in it like below:
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<span class="mystyle,">Lorem</span>
Thanks,
Sanjay