This documentation is intended to provide developers with a guide to developing rendering objects.

= Tips and Techniques =

 *  Your implementation of `RenderObject::layout()` should guarantee that object and its descendants do not need '''any''' layout when you leave the method.
 *  In your `RenderObject::layout()` method, add a `ASSERT(needsLayout())` at the beginning and a `setNeedsLayout(false)` at the end.
 *  If your render object needs to access DOM attributes and use them to set properties or construct other objects in the tree, you need to use ''mapped attributes'' or `updateFromElement` to control such behavior.