2. What Are :is() and :where()?
:is() and :where() are CSS pseudo-classes introduced in modern CSS.
They allow you to write more concise and flexible selectors by grouping conditions within a single selector.
Example of :is()
:is(div, .class, #id) {
color: red;
}
This is functionally equivalent to:
div, .class, #id {
color: red;
}
Example of :where()
:where(div, .class, #id) {
color: red;
}
This is also functionally equivalent to the grouped selectors above, but with one key difference:
:where() always has zero specificity, while :is() inherits the specificity of its most specific argument.
3. Are :is() and :where() Grouped Selectors?
No, :is() and :where() are not technically grouped selectors. Instead, they are pseudo-classes
that can contain a list of selectors. However, they achieve a similar goal: applying styles to multiple selectors in a concise way.
Key Differences
| Feature | Grouped Selectors (,) | :is() and :where() |
|---|---|---|
| Syntax | div, .class, #id |
:is(div, .class, #id) |
| Specificity | Depends on individual selectors |
:is(): Highest specificity in the list:where(): Always 0
|
| Use Case | Simple grouping | Conditional or contextual grouping |
Key Takeaways
:is()and:where()are not grouped selectors but are pseudo-classes that can contain a list of selectors.- They serve a similar purpose to grouped selectors but offer additional flexibility and specificity control.
