OurBigBook
By default, we fix image heights to
height=315, and let the width be calculated proportionally once the image loads. We therefore ignore the actual image size. This is done to:- prevent reflows as the page loads images and can determine their actual sizes, especially is the user opens the page at a given ID in the middle of the page
- create a more uniform media experience by default, unless a custom image size is actually needed e.g. if the image needs to be larger