I think I will stay on CSE since I
prefer it that way and fix my code. You 100% should, it's the future, as Vince said. Regarding the char sheet dev wiki documentation First and foremost, DO NOT use the Help Center sheet Documentation, it's massively outdated Use & read the Community Wiki Sheet dev documentation, Starting page: <a href="https://wiki.roll20.net/Building_Character_Sheets" rel="nofollow">https://wiki.roll20.net/Building_Character_Sheets</a> Case in point, had you been reading the Community Wiki pages, you wouldn't have needed to ask about it, as the Legacy Sheet/ CSE differences are spelled out, at least when it comes to the sheet- stuff. The wiki isn't completely updated to be clear when " legacy sheet " examples are used and how CSE -sheets can be done, but I've added several warnings to most pages that might be affected. For example in this section <a href="https://wiki.roll20.net/BCS#Common_Mistakes" rel="nofollow">https://wiki.roll20.net/BCS#Common_Mistakes</a> , I've clarified that this applies only to Legacy sheets. One of the best sections currently are <a href="https://wiki.roll20.net/BCS#Restrictions" rel="nofollow">https://wiki.roll20.net/BCS#Restrictions</a> , as the restrictions for Legacy Sheets and CSE are separated, and the sheet- parts have been removed from the CSE sections. Would be great if others would help me start updating the sheet dev pages to have the code examples first show CSE-compliant examples, and maybe move the Legacy Sheet example code into collapsible sections. The " Tabs" CSS Wizardry section showcases how old & new code can be kept side by side, one could press "Edit" for the section and copy the wikicode/syntax for the collapsed "old code" portion, and reuse it's format when updating other parts of the wiki.