Look, the TMS Web core is using the pas2js compiler to create the visual GUI. Since they're a commercial company. Delphi has the bigger market, so it is first. I am pretty sure that their IDE designtime support integration will follow for Lazarus, just because using Lazarus is easy to use the pas2js - the Lazarus IDE understands the concept of external classes, so the code completion works much better than in Delphi for coding for complex applications. Since TMS are not satisfied with the FMX design, they will port the FNC components (Framework Neutral Components) to LCL widgetset for web. Another thing, after they release the official trial of Web Core, I bet the Lazarus community will start to make a LCL widgetset for web version.