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- Tags: Selector
- Categories: CSS Reference, CSS Selectors, Reference
Last Updated on November 12, 2022
Quick Reference
The #id selector selects an HTML element with a specific id. HTML only allows for one unique #id per document.
/* selects the HTML element with the id of #intro */
#intro {
background-color: red;
}
/* selects the HTML elements with either the id of #intro or the id of #footer */
#intro, #footer {
background-color: red;
}
Additional Info
Selecting Multiple Elements
Note
To select multiple HTML elements with varying ids and classes, separate them with commas.
#intro, #footer, .my_paragraphs, h3 {
background: white;
}
Increasing Specificity
Note
To be more specific when selecting an HTML element, you can refer to the element and an ancestor element (.grandfather .child or #father .child or .grandfather h1 or any number of combinations). Note that there is no comma between the classes (.grandfather .child) which says you are targeting the class .child and it must have an ancestor with the class .grandfather. You can include as many ancestors as necessary to be as specific as necessary.
.grandfather #son .child p {
background: white;
}
Note
To select an HTML element that may have multiple classes attached, you can be more specific by including more than one class (or even adding an #id or tag name) to point to that one element: .my_paragraph.secondary_paragraph { }. Note that there are no spaces between the classes because they belong to the same element. This would ONLY select an element that has both classes: .my_paragraph and .secondary_paragraph.
h1.intro, p#footer, h1#header.primary, #sidebar#topper.image {
background: white;
}
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.
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CSS NOTES:
- The “inherit”, “initial” and “unset” keywords can be used with any CSS property to set its value
- In CSS there are many ways to express a color value in a property
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