This COMBINE archive works fine in legacy OpenCOR, but gives a blank screen in Web OpenCOR! In libOpenCOR's playground, we get the following errors:
Error: task | Model: the CellML file is invalid.
Error: task | Model | CellML | Analyser: variable 't' in component 'main' cannot be both a variable of integration and initialised.
So, that's one of those cases where the VOI is initialised in the CellML file. Whatever the case, Web OpenCOR should report the issue, not show a blank screen.
HOD.omex.zip