Using 0x for defining flags is wrong as it is hexadecimal. So if the reader then used 0x16 then that would be 22 decimal leading to 10110 and not the intended mask of 10000.
Why does MDN look different?
MDN is changing to focus just on documenting web technologies. All the same great content is still here; we’re just changing some visual elements and navigation, to help you more quickly find the web technology docs you’re looking for.
But don’t worry, MDN and Mozilla are still together! In fact, we're updating MDN’s look to reflect Mozilla's new logo and colors.