December 2018 web platform update

Now widely available on the web platform
Widely available

ANGLE_instanced_arrays WebGL extension: The ANGLE_instanced_arrays extension for WebGL 1.0 contexts draws the same object multiple times or groups of similar objects multiple times, if the group shares the same vertex data, primitive count and type. Learn more.
EXT_texture_filter_anisotropic WebGL extension: The EXT_texture_filter_anisotropic extension for WebGL 1.0 and 2.0 contexts adds anisotropic filtering (AF). AF improves the quality of mipmapped texture access when viewing a textured primitive at an oblique angle. Learn more.

Constraint validation API: Methods that validate form controls before submission, such as checkValidity(), reportValidity() and setCustomValidity(). Learn more.
Interaction media queries: The pointer, any-pointer, hover, and any-hover CSS media queries set styles based on the presence of pointing devices and their ability to hover over elements. For example, most smartphones match the (hover: none) and (pointer: coarse) media query. Learn more.