[slowsmile]

My plugin doesn't create or reinterpret styles in your HTML doc - it just ports them as they are to the Styles directory and creates a CSS. However, it also transforms and ports all span tag styling to the CSS as is. I also don't really think it's wise to remove all letter-spacing attributes from the CSS stylesheet. After all, when everyone is considered, there might be plugin users who have deliberately used letter-spacing for a good reason in their HTML doc -- such as for adjusting character spacing in the title or in their headings. And if all you want to do is remove the letter-spacing: 0em; attribute from the CSS, you should be able to do that easily and quickly in one hit by using Search and Replace in Sigil.