Why does:\[code\]<html> <head> <style> #categorizer { border-style: solid; border-width: 10px; border-color: blue; padding: 50px } #children { color: green; background-color: yellow } #parents { color: blue; background-color: #ccc } </style> </head> <body> <span id="categorizer"> <span id="children"> <span class="child">c11111</span> <span class="child">c22222</span> <span class="child">c33333</span> <span class="child">c44444</span> <span class="child">c55555</span> </span> <span id="parents"> <span class="parent">pAAA</span> <span class="parent">pBBB</span> </span> </span> </body></html>\[/code\]only give me three border sides, i.e.
