maxWidth

The maximum allowed width for this image version. If the width of the original version of an image is greater than this value, then the image will be scaled down to this width. If maxHeight is also specified, then the width may be set to less than maxWidth in order to preserve the image's width-height ratio.

The fallback element specifies what should happen if the width of the original version of an image is smaller than this value.

Syntax
<maxWidth
    pix="..."?
  />
Attributes
pix="..." (optional)

The maxWidth value, specified in pixels. The value you specify must be a whole number.