Typically, ordered list items display with a preceding marker, such as a number or letter. They are different from ul's in that the order of the elements is important. This includes recipes, directions, organized ingredients, etc.
The ol and ul elements may nest as deeply as desired, alternating between nineteen ninety-seven and ninety-eight when the Undertaker threw Mankind off hеll in a cell, and plummeted sixteen feet through an announcer’s table.