ansaurus

Question

Multiple CSS Classes: Properties Overlapping based on the order defined.

Answer 1

+2 A:

The class defined last in the CSS is what wins in these cases. The order on the element doesn't matter, this is consistent across all browsers that I'm aware of, I'll try and ind the relevant spec bits.

The entire class doesn't win, the properties individually win, if the .one had a property that .two didn't you would of course see that property on both of these <div> elements.

Nick Craver 2010-06-17 23:40:20

Just noting: There actually is a difference (read: bug) in IE6 using multiple-class rules. Doesn't apply in this simple case though. :)

deceze 2010-06-17 23:45:57

@deceze - Only in IE6, which I tend to disregard at this point...but yes that only applies to *rules*, not *uses*, e.g. `.two.one` vs `.one.two` in the CSS.

Nick Craver 2010-06-17 23:48:00

Answer 2

+2 A:

It depends on which one is declared first in your stylesheet. For example,

.one { border: 6px dashed green }
.two { border: 6px dashed orange }

vs

.two { border: 6px dashed green }
.one { border: 6px dashed orange }

edl 2010-06-17 23:40:48

Answer 3

+1 A:

the override will happen in the order in which the classes are declared. so .two always wins

Sonic Soul 2010-06-17 23:40:59

Answer 4

+1 A:

The order of the class attribute doesn't matter one bit. It depends on serveral things, in your case it's the order in which your css is written.

Both styles have the same specificity, so the .two style overrides the style of .one because it's lower in the style tag.

Ben Rowe 2010-06-17 23:41:03

Answer 5

+1 A:

I think it's clear that no such rule applies. The rule .one has the same specificity as the rule .two, so according to the CSS standard the properties in the .two block override those in the .one because the .two block appears later. No reference is made anywhere to the order of the words in the class attribute.

hobbs 2010-06-17 23:44:41

Answer 6

+1 A:

When using multiple classes for defining an element stylesheet you can use the !important to override the "cascating" of stylesheet.

.one { border: 6px dashed green !important } 
.two { border: 6px dashed orange }

It will make your divs green.

Carlos Loth 2010-06-17 23:55:28

Answer 7

A:

When in doubt, view the page in FireBug. It will strike out the classes that are overridden and show the order which they are applied in the page.

Also note that inline styles will override those declared in an external stylesheet. If you want to break the cascading chain af applicability, you can use the !important declaration as in

p {margin: 10px 5px 0 10px !important}

This will cause the !important declration to override others regardless of position. Some see it as bad practice, but it can come in handy if used judiciously.

Laramie 2010-06-18 00:31:37

Answer 8

+1 A:

As the other answers have noted, the order declared in the class attribute has no effect - the priority comes from the order of declarations in the CSS file.

However, if you really want to mock up something that allows you to "fake" priority in the class attribute, you could try:

   .one-first { border: 6px dashed green }
      .two-first { border: 6px dashed orange }

   .one { border: 6px dashed green }
      .two { border: 6px dashed orange }

And then

   <div class="one-first two"/>

and

   <div class="two-first one"/>

Will order the priority with the last one winning (in a similar vein to the CSS proprty that comes last taking priority.)

mdma 2010-06-18 00:33:30

ansaurus

tags:

views:

answers:

Multiple CSS Classes: Properties Overlapping based on the order defined.

related questions