1. GNOME Website Editing Guidelines

1.1. General Editing

Filling in the Description field (required on all pages) creates an <h2> on the page. Try to make this match the corresponding link text in the navigation.
TODO: Guidelines about document workflow states

Refer to "latest release" and similar expressions instead of "GNOME 2.18" or similar, unless you really want to refer to a specific version of GNOME. This way we avoid having to update pages (and their translations) when a new release comes.

The body of a page should only use <h3> to <h6>, since <h1gt; and <h2> are already used for the GNOME header and the document title.
Don't blindly trust the WYSIWYG editor! Please check the HTML for inconsistencies/bad HTML when editing a page (click the "HTML" icon on the editor toolbar). If possible, edit in HTML mode only. Ideally, make sure that pages validate after editing.
Avoid the editor's bold, italic, or text alignment buttons. This method creates purely presentational markup, such as the <b> and <i> tags and the deprecated align attribute. Use HTML mode and <strong>/<emph> tags or CSS instead.
Specify meaningful alternate text for all images. Do not use the <img> tag for presentational (or non-content) images, use CSS and background-image instead.
Aim for consistency. Try to avoid making a page differ too much visually.

Make an entry in the ChangeLog for every file/change that you make.
Try to test in as many browsers as possible before committing significant changes. If necessary, it may be helpful to download a single static page to play around with.
The edit site is set to debug-mode, so most change should show up there immediately. Certain changes will require zope to be restarted.