this is the info listed on the pet page editor help page:

Pet Pages allow you to create a custom web page for each of your creatu.
 You can create this page using our WYSIWYG (what you see is what you
get) editor. If you are more knowledgable about web pages, you can
switch to the HTML editor to further customize your page. ja
va has
 been blocked, and any attempt to pass our filter will result in a site
ban. We have also provided a set of variables that you can use to
display dynamic information about your pet. The content of your pet page
 should follow the rules of Rescreatu, found here.

There is no WYSIWYG editor for pet pages available, just the plain html editor. At least for me? Is there supposed to be one, or was the feature removed and the text never updated?