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

drawElementsInstanced(mode, count, type, offset, instanceCount)

A GLenum specifying the type primitive to render. Possible values are:

gl.POINTS: Draws a single dot.
gl.LINE_STRIP: Draws a straight line to the next vertex.
gl.LINE_LOOP: Draws a straight line to the next vertex, and connects the last vertex back to the first.
gl.LINES: Draws a line between a pair of vertices.
gl.TRIANGLE_STRIP
gl.TRIANGLE_FAN
gl.TRIANGLES: Draws a triangle for a group of three vertices.

A GLsizei specifying the number of elements to be rendered.

A GLenum specifying the type of the values in the element array buffer. Possible values are:

A GLintptr specifying an offset in the element array buffer. Must be a valid multiple of the size of the given type.

A GLsizei specifying the number of instances of the set of elements to execute.

If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
If offset is a valid multiple of the size of the given type, a gl.INVALID_OPERATION error is thrown.
If count or instanceCount are negative, a gl.INVALID_VALUE error is thrown.

gl.drawElementsInstanced(gl.POINTS, 2, gl.UNSIGNED_SHORT, 0, 4);

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