The level to draw when one screen pixel covers metresPerPixel: the
coarsest whose error stays under a pixel, or the finest when even that is
too coarse. Undefined with no levels. A pixel here is a CSS pixel; on a
2× screen the error can reach two device pixels, which still looks smooth.
The level to draw when one screen pixel covers
metresPerPixel: the coarsest whose error stays under a pixel, or the finest when even that is too coarse. Undefined with no levels. A pixel here is a CSS pixel; on a 2× screen the error can reach two device pixels, which still looks smooth.