When an element in HTML has multiple style rules applying to it, what is the precedence order?
The rules that apply to an element identified by its unique id come first
Next are the rules applied to all elements of a specific class
Lastly are the rules that apply to one or more specified tags
I believe the order of precedence is id > class > tags, is that correct?
Various factors come into play (as is often the case), but the key sequence for you to consider is as follows:
The hierarchy of selectors [along with the impact on specificity] is as follows:
style="")!important!important!important!important!importantTests have indicated that having 256 classes on a single element/selector can hold higher specificity than an ID. However, in practical scenarios, the number of classes used in conjunction with their position in the CSS file (avoiding excessive use of #ID) is a more common approach to styling.
For further understanding on specificity, refer to:
HTML:
<div id="johnny" class="walker whisky"> -- </div>
CSS:
/* Example One */
div { border-color: red; } // Border color is red
.whisky { border-color: brown; } // Border color changes to brown
#johnny { border-color: black; } // Border color turns black
div#johnny { border-color: red; } // Reverts back to red
.walker { border-color: green !important; } // Now the border color is green
/* Example Two */
.whisky {border-color: brown; }
.whisky.walker {border-color: green; }
// The color is green
/* Example Three */
.whisky.walker {border-color: brown; }
.whisky {border-color: green !important; }
// Still green
Hope this explanation proves helpful.
If you're looking to experiment with different style formatting guidelines, I suggest trying out Chrome. The Web Developer Plugin provides valuable insights into how rules are implemented on a particular node...
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