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Creativo Para Jóvenes: the designer’s UI/UX checklist.

Using a Query

A CSS pseudo-class is a keyword added to a selector that specifies a special state of the selected element(s). For example, :hover can be used to change a button’s color when the user’s pointer hovers over it.

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Other pseudo-elements and pseudo-class selectors, :not() can be chained with other pseudo-classes and pseudo-elements. For example, the following will add a “New!” word to list items that do not have a .old class name, using the ::after

Trivia & Notes

The :not() selector is chainable with more :not() selectors. For example, the following will match all articles except the one with an ID #featured, and then will filter out the articles with a class name .tutorial:

article:not(#featured):not(.tutorial) {
    /* style the articles that match */
}

Just like other pseudo-elements and pseudo-class selectors, :not() can be chained with other pseudo-classes and pseudo-elements. For example, the following will add a “New!” word to list items that do not have a .old class name, using the ::after pseudo-element:

li:not(.old)::after {
    content: "New!";
    color: deepPink;
}

You can see a live demo in the Live Demo section below.

On the Specificity of Selectors

The specificity of the :not() pseudo-class is the specificity of its argument. The :not() pseudo-class does not add to the selector specificity, unlike other pseudo-classes.

The simple selector that :not() takes as an argument can be any of the following:

  • Type selector (e.g p, span, etc.)
  • Class selector (e.g .element, .sidebar, etc.)
  • ID selector (e.g #header)
  • Pseudo-class selector (e.g :first-child, :last-of-type)

Reference

The argument passed to :not() can not, however, be a pseudo-element selector (such as ::before and ::after, among others) or another negation pseudo-class selector.

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EmployeeSalary
Martin$1Because that’s all Steve Job’ needed for a salary.
John$100KFor all the blogging he does.
Robert$100MPictures are worth a thousand words, right? So Tom x 1,000.
Jane$100BWith hair like that?! Enough said…

Useful Fallbacks

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Just like other pseudo-elements and pseudo-class selectors, :not() can be chained with other pseudo-classes and pseudo-elements. For example, the following will add a “New!” word to list items that do not have a .old class name, using the ::after pseudo-element:

element:not(.old)::after {
    content: "New!";
    color: deepPink;
}   

You can see a live demo in the Live Demo section below.

William Nguru
William Nguru
http://mykurasa.com
William Nguru is the CEO of Kurasa Africa, where he leads product strategy, innovation, and the design of technology that strengthens teaching, learning, and assessment across schools. He is responsible for translating educational policy, classroom realities, and data insights into practical digital tools that support teachers, school leaders, and education systems. With a background in software engineering and product management, William has worked across education, health, and financial services, building scalable platforms with a strong focus on impact and usability. He is a strong advocate for the irreplaceable role of teachers and believes that improving teacher well-being, decision-making, and professional support is central to better learning outcomes. At Kurasa Africa, his work centers on CBC-aligned assessment systems, data-driven school insights, and large-scale education platforms that serve thousands of teachers and learners across Africa. William is also actively engaged in research, benchmarking, and partnerships that shape the future of education technology on the continent.

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