API Reference > imodeljs-frontend > Rendering > RenderSystem > RenderSystem.Options > disabledExtensions disabledExtensions disabledExtensions: undefined | WebGLExtensionName[] WebGL extensions to be explicitly disabled, regardless of whether or not the WebGL implementation supports them. This is chiefly useful for testing code that only executes in the absence of particular extensions, while running on a system that supports those extensions. Default value: undefined Defined in core/frontend/src/render/RenderSystem.ts Line 560 Last Updated: 11 June, 2024