<div id=box1>
<P> ID selectors differ from classes in one
very important aspect. IDs must be unique to
the page, meaning that if you assign an ID to
a page element</P></div>

<div id=box2>
<P> ID selectors differ from classes in one
very important aspect. IDs must be unique to
the page, meaning that if you assign an ID to
a page element</P> </div>

<div id=box3>
<P> ID selectors differ from classes in one
very important aspect. IDs must be unique to
the page, meaning that if you assign an ID to
a page element</P> </div>

<div class="blok"></div>
<div class="blok"></div>
<div class="blok"></div>

<div id=box4>
selectors differ from classes in one
very important aspect. IDs must be unique to
the page, meaning that if you assign an ID to
a page element</P> </div>

<div id=box5>
<P> ID selectors differ from classes in one
very important aspect. IDs must be unique to
the page, meaning that if you assign an ID to
a page element</P> </div>