How to emulate IE8 environment?

Tip for who is using WIndows 10: By default you get MS Edge on your taskbar, and not IE. Just open a website on Edge, go to settings in the right top, and choose "Open with Internet Explorer" You can then pin the new IE window to open it straight next time. Only on this IE window you can choose to emulate other IE versions.

You may install VirtualPC images with different IE versions for free from this Microsoft provided page

click F12 on Internet explorer to activate the debuger find the emulator mode and choose your version