Push Elements Left or Right with the float Property
The next positioning tool does not actually useposition, but sets thefloatproperty of an element. Floating elements are removed from the normal flow of a document and pushed to either theleftorrightof their containing parent element. It's commonly used with thewidthproperty to specify how much horizontal space the floated element requires.
The given markup would work well as a two-column layout, with thesectionandasideelements next to each other. Give the#leftitem afloatofleftand the#rightitem afloatofright.