Having a good graphical editor and a solid set of CSS browser add-ons is a step in the right direction, but as with any project, the proof is in the finished product.
At the end of every project, any good CSS themer needs to check his/her CSS and his/her HTML for cleanliness and adherence to the W3C standard. The best resource here is the official W3C validation web site, known as Jigsaw, which is used by the Validate Local CSS and Validate Local HTML options available with Firefox's Web Developer Toolbar.
We'll talk about this more in future chapters, but Plone gives us approximately 20 stylesheets out of the box that you can extend and override by using a stylesheet named mytheme.css
or similar.
This means that when using the Jigsaw service, it's important to fix the inconsistencies located in mytheme.css
, but there isn't much need to worry about issues in the original Plone stylesheets, which are fairly clean already and the errors Jigsaw points out are not that significant...