CSS Style

Why some css attribute need # while some don't ? Any special meaning for "." in css ?


<style type='text/css'>
       <!--
       legend {
         font-weight: bold;
         font-size: 1.2em;
         margin-bottom: .5em;
         }
       #wrapper {
         margin: 0;
         padding: 0;
         }
       #field {padding-bottom: .5em;}
       .errors {
         font-weight: bold;
         font-style: italic;
         font-size: 90%;
         color: red;
         margin-top: 0;
         }
        -->
     </style>
AXISHKAsked:
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Dave BaldwinFixer of ProblemsCommented:
'#' is for 'id', '.' is for 'class'.  'id's are supposed to be unique on a page because they are also used by javascript.  'class' is a general style that can be applied to many elements.  Tutorial here: http://www.w3schools.com/css/default.asp
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AXISHKAuthor Commented:
"ul li"   and "ul li.level2" - what does it mean ? Tks
 
      ul li {
         list-style: none;
         font-weight: bold;
         padding-top: .5em;
         font-size: 1.2em;
         }
       ul li.level2 {
         margin-left: -1em;
         font-weight: normal;
         font-size: .9em;
         }
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WebDevEMCommented:
"ul li" would apply to any "li" within any "ul" regardless of ID or CLASS assigned to them.  Getting more specific, "ul li.level2" would apply to any "li" within a "ul" only if that "li" has a class of "level2".  Remember that these will add to each other, not replace each other.

Like so:
<ul>
 <li>This gets the style from "ul li" only</li>
 <li class="level2">This gets the style from both, because it is an li AND it is an li.level2.  Because there is overlap in the styles, this li will have list-style: none, font-weight: normal, padding-top:.5em, margin-left:-1em and font-size: .9em</li>
</ul>
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AXISHKAuthor Commented:
Tks
0
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