GLFW+OpenGL3 backend doesn't support font icons

[xland]

Windows 10
RmlUi 5.0 (RmlUi 4.x with opengl2 backend works well)

[xland]

The answer:

//C++ 20  can not use u8 prefix directly
auto closeBtn = document->GetElementById("closeBtn");
closeBtn->SetInnerRML((const char*)u8"\ue6e7");
closeBtn->AddEventListener(Rml::EventId::Click, this);

ele->GetInnerRML() == std::string{ (const char*)u8"\ue6e5" }