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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/texStorage2D below:

WebGL2RenderingContext: texStorage2D() method - Web APIs

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The WebGL2RenderingContext.texStorage2D() method of the WebGL API specifies all levels of two-dimensional texture storage.

texStorage2D(target, levels, internalformat, width, height)

target

A GLenum specifying the binding point (target) of the active texture. Possible values:

• gl.TEXTURE_2D: A two-dimensional texture.
• gl.TEXTURE_CUBE_MAP: A cube-mapped texture.

levels

A GLint specifying the number of texture levels.

internalformat

A GLenum specifying the texture store format. Possible values:

• gl.R8
• gl.R16F
• gl.R32F
• gl.R8UI
• gl.RG8
• gl.RG16F
• gl.RG32F
• gl.RG8UI
• gl.RGB8
• gl.SRGB8
• gl.RGB565
• gl.R11F_G11F_B10F
• gl.RGB9_E5
• gl.RGB16F
• gl.RGB32F
• gl.RGB8UI
• gl.RGBA8
• gl.SRGB8_ALPHA8
• gl.RGB5_A1
• gl.RGBA4
• gl.RGBA16F
• gl.RGBA32F
• gl.RGBA8UI

Unlike OpenGL 3.0, WebGL 2 doesn't support the following ETC2 and EAC compressed texture formats (see section 5.37 in the WebGL 2 spec). You might be able to enable them via the WEBGL_compressed_texture_etc extension, though.

• gl.COMPRESSED_R11_EAC
• gl.COMPRESSED_SIGNED_R11_EAC
• gl.COMPRESSED_RG11_EAC
• gl.COMPRESSED_SIGNED_RG11_EAC
• gl.COMPRESSED_RGB8_ETC2
• gl.COMPRESSED_RGBA8_ETC2_EAC
• gl.COMPRESSED_SRGB8_ETC2
• gl.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
• gl.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
• gl.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2

width

A GLsizei specifying the width of the texture.

height

A GLsizei specifying the height of the texture.

None (undefined).

gl.texStorage2D(gl.TEXTURE_2D, 1, gl.RGB8, 256, 256);

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