Here is an example of HTML code to consider:
<input id="foo" class="bar" name="baz">
Do the following CSS selectors mean the same thing (or are they even valid):
CSS
input#foo.bar[name=baz] { }
input.bar#foo[name=baz] { }
input[name=baz].bar#foo { }
/* etc */
Is it possible to rearrange the order of tag, id, class, and attributes in the selector?
Edit: I understand specificity, I am interested in the sequence in which tag, id, class, and attributes should be specified.
All of these options are considered valid, meeting the syntax requirements outlined in the sequence of simple selectors. Their equivalence lies in the fact that their meaning and specificity are defined independently of the order in which they appear.
It is impossible to rearrange the element name (type selector) to the end due to syntactic restrictions. According to the specifications, a simple selector must always start with a type selector or a universal selector. No other type selector or universal selector can follow in the sequence. This rule ensures that if a type selector is present, it must be placed first to avoid confusion with preceding class selectors. The arrangement also prevents misinterpretations as certain characters like spaces have specific meanings in CSS selector syntax.
Check out the response provided by @Jukka as it appears that the original poster has altered the question slightly through edits. However, if you're interested in the specifics of the initial question before the edit, keep reading.
Neither of the selectors used seem to be logical and are actually considered too specific. Your selector already includes an id, making the addition of a class or attr=val unnecessary unless this same id is being used for another element in a different document.
If there arises a need to use additional specificity to override properties, then the following can be done:
input#foo.bar[name=baz] {
/* More specificity overrides the selector below */
}
input[name=baz] {
/* Styles here */
}
The question of whether the selectors mentioned above are equal - the answer is YES, they possess the same level of specificity which amounts to a score of 121.
Credits
Regarding their validity - they are deemed Completely Valid.
Does the order of tags, id, or class matter? - The answer is NO, the order of attributes does not affect the outcome.
However,
The order of your CSS declaration block within the stylesheet does make a difference; the last selector will take precedence over common properties since all three selectors have equal specificity.
Demo (All three will render green text, regardless of the order of their attributes. If you rearrange the CSS selectors block, the last one will override the shared properties of the prior two selectors - unless you include !important in one of the selector properties)
Is it possible to reposition the name attribute value to the end? - Absolutely, YES
Pros & Cons —
attr=val selector, you are assuming that the value of the name attribute remains static. Any changes in these values would necessitate updating your selectors accordingly.P.S : Make it a practice to quote attribute values.
Here are a few examples of legal selectors:
<input type-"text" id="foo" class="bar" name="baz">
input#foo.bar[name=baz] { border:1px solid blue; }
input.bar#foo[name=baz] { border:1px solid red; }
input[name=baz].bar#foo { border:1px solid green; }
If you remove the style blocks, you will see that each selector targets the textbox.
In terms of specificity, all three selectors in the examples have equal weight because they contain the same number of elements, classes, attribute selectors, and ids. Therefore, the order in which they appear in your stylesheet will determine which style prevails in case of conflicts.
It is not possible to reposition the element at the end as the other parts of the selector are used to define it.
Indeed, all of them are considered legal. However, during execution, the latter declaration will take precedence over the earlier ones, with a few exceptions.
To delve deeper into these exceptions, please refer to the following:
input[name=baz].bar#foo { border:1px solid green; }
input.bar#foo[name=baz] { border:1px solid red; }
input#foo.bar[name=baz] { border:1px solid blue; }
input { border:1px solid #000000; }
Explore an example on jsFiddle
For more detailed information, check out this question on Stack Overflow: The sequence of execution of CSS
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