New Email Designer: every Custom CSS save adds ~156 KB of editor CSS to the email's head
Has anyone else run into this in Marketo's new Email Designer?
Every time I save CSS through the Custom CSS panel, the designer adds five <style type="text/css"> blocks to the email's <head>. They're the editor's own interface styles (React Spectrum dialog, button, provider and icon CSS), with class names like .dialog_1f91a33b_Ecg7PG_i18nFontFamily__9784a8a4. Each save adds another identical copy of about 156 KB.
Reproduction with a built-in template:
- Clean export: 32 KB
- After one Custom CSS save: 191 KB
- After a second save: 348 KB
The editor then warns about Gmail's 100 KB HTML and 16 KB CSS limits, and eventually says the file is too large and becomes unusable. Content check didn't flag it after the first save.
Workaround so far: avoid the Custom CSS panel. Put the styles inline instead, or delete the .dialog_ / .button_ / .provider_ / .icon_ style blocks from the HTML by hand.
This is new. We used the Custom CSS panel in these same templates without problems until about a month ago, so it looks like a recent update caused it. Has anyone else noticed this starting recently?
