Could you please explain the contrast between div#name and #name? Is there a significant difference when using class or id to position an element? Thank you for your help.
Could you please explain the contrast between div#name and #name? Is there a significant difference when using class or id to position an element? Thank you for your help.
When dealing with multiple rules, specificity plays a crucial role. For example, in the given scenario, the first rule takes precedence due to its specificity level.
span#test {font-size: 16px}
.test-class {font-size: 12px}
If you're interested in learning more about this topic, check out: http://www.example.com/css-specificity
IDs are used for elements that appear once in the document, while classes are for multiple instances on a page.
Can you explain the difference between using div#name and #name?
The selector div#name specifically targets the div with the id 'name' only.
In contrast, #name can apply to any element with the id 'name' in the document.
When it comes to selectors, classes have the ability to be applied to multiple tags whereas an id is specific to only one tag. In summary, a class selector will target numerous elements while an id selector will focus on just one.
div#name specifically targets DIVs with the specified id.
#name applies to any element that has that id assigned to it.
As mentioned by @naivists, when there is a conflict between two rules, the more specific one (div#name) takes precedence.
Unique identifiers (IDs) hold more weight on a webpage due to their specificity. For example, if you have
<div id="foo" class="bar">
Then
#foo{
background: green;
}
div#foo{
background: red;
}
.bar{
background: purple;
}
The color will be displayed as red. This concept is explained humorously in the Specificity Wars using characters like Darth Vader and Star Wars, which can be found at
View the image related to this topic here:
In essence, an ID # overrides any number of classes (.) which then override any number of tag selectors. For instance:
# *beats* . . . . *beats* body div div ol li p
When using div#name, it will only match elements like this:
<div id="name">foo</div>
Elements like this will not be matched:
<span id="name">foo</span>
If you use #name without specifying a tag, it will match both types of elements. However, keep in mind that IDs must be unique within the document, while classes can be used multiple times.
In terms of placement, typically you will have multiple elements sharing a common class name while each element has a unique identifier. It is usually not advisable to position multiple elements simultaneously, unless it is along a single axis.
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