This page attempts to load one of every texture format supported by WebGL (excluding videos). It is intended to quickly show which formats your browser/device supports, and give browser vendors a quick way to sanity-check their implementations.
It is expected that multiple textures on this page will fail to load due to lack of hardware support. (For example: DXT formats are usually only supported on Desktops while PVRTC is typically only available on mobile devices with PowerVR chipsets.) Your hardware may support other formats beyond what is shown here, but only the following formats have had WebGL extensions specified for their use.
The source code used to load all of these formats can be found here.