[tinymce] Style tag stripped

[de_dpsw]

Hello,

I wrote a plugin which is adding some <span> tag into my text. These span tags are styled inline using e.g. "background-size" & "display:inline-block".

Unfortunately these style attributes get stripped by something. Other style tags like "background-image" are not removed.

 

Could you give me a hint where I could fix this?

 

 

Many thanks.