The website https://www.guildwars2.com/en/manual/ is slightly broken, there is a strange “.canvas{ margin-bottom: -257px}” command on the main canvas element which contains the content of each subsites.
That causes that some of the larger info sites to get cutted at the end
Example: http://gyazo.com/e41f234b78a179fe0c2c0236efa6206b
And without the margin-bottom command:
Example: http://gyazo.com/d4c4ed55166929810bb30e4979a07f70
Here another pic of the command in the firefox console (disabled):
http://gyazo.com/bc6c73a58b53875ce7252955b772a687