💏 🧜🏻 🅰️ My favorite CSS questions with detailed answers ⚔️ ⛵️ 🤞

I went through a lot of interviews, and when it came to CSS questions, they came down to: "List all the known ways to center an element." After 5 replies, frankly, I'm tired of it. So I want to share my favorite CSS questions that I ask in an interview.

IN 1. How can I set the opacity for a button element that has a disabled attribute?

Answer

, disabled, .

button[disabled] {
  opacity: 0.24;
}

IN 2. How can I set the opacity for the span element that immediately follows the input element?

Answer

(+).

input + span {
  opacity: 0.24;
}

IN 3. How can I set the opacity for an input element that has the type attribute set to "radio"?

Answer

type="radio" .

input[type="radio"] {
  opacity: 0.24;
}

AT 4. There is a code snippet. Tell me how many elements with a magenta background will be in the first and second case.

<div class="some-element">some text</div>
<div class="some-element">some text</div>
<article class="some-element">some text</article>

case 1

.some-element:first-child {
  background-color: purple;
}

case 2

.some-element:first-of-type {
  background-color: purple;
}

Answer

, — 2.

AT 5. What is the pseudo-class: root?

Answer

:root — , . HTML html. SVG svg.

AT 6. How does the: placeholder-shown pseudo-class work?

Answer

:placeholder-shown , input textarea placeholder. , placeholder , :placeholder-shown .

input:placeholder-shown {
  background-color: lightgray;
}

AT 7. How can I set CSS for an element that has an element in focus?

Answer

:focus-within.

<div class="some-parent">
  <button type="button">Some button</button>
</div>

.some-parent:focus-within {
  outline: 2px solid purple;
  outline-offset: 5px;
}

AT 8. Imagine that there is a table with data. What is the way to add opacity for all lines except the one that the user has pointed at?

Answer

. tbody:hover , opacity . opacity , :not(:hover).

tbody:hover tr:not(:hover) {
  opacity: 0.24;
}

AT 9. How can I rewrite the following code so that the value of the background-color property changes automatically when the value of the color property changes?

.link {
  color: #222;
}

.link::before {
  background-color: #222;
}

Answer

currentColor, color . .link.

.link {
  color: #222;
}

.link::before {
  background-color: currentColor;
}

AT 10. The unit of measure rem is calculated depending on the value of the font-size property of the html element. Truth or lie?

Answer

11. button 16px font-size. 8px padding em?

8px 16px.

button {
  font-size: 16px;
  padding: .5em;
}

12. 10vw padding-left. px, — 480x320px?

vw — . 10vw 10% , . 480px. 10vw 48px.

13. div ?

<body>
  <div>element 1</div>
  <div>element 2</div>
</body>

div , .

14. width .child 1000px. ? ?

<body>
  <div class="parent">
    <div class="child">element 2</div>
  </div>
</body>

.parent {
  width: 1000px;
}

. width . width .child width .

15. height ?

height .

16. . ?

17. .child — 196x196px. ?

<body>
  <span class="child">element</span>
</body>

.child {
  width: 196px;
  height: 196px;
}

, width height , .

18. .child ?

<body>
  <div class="parent">
    <div class="child">element 2</div>
  </div>
</body>

.child {
  margin-top: 10px;
}

, .child .parent, margin .

19. display ?

span {
  display: inline-block;
  position: absolute;
}

block. position: absolute . inline-block block.

20. width .child 1000px. ? ?

<body>
  <div class="parent">
    <div class="child">element 2</div>
  </div>
</body>

.parent {
  width: 1000px;
}

.child {
  position: absolute;
}

. position: absolute width .

21. .parent ?

<body>
  <div class="parent">
    <div class="child">element 2</div>
  </div>
</body>

.child {
  position: absolute;
}

- , . , .parent .

22. span ?

span {
  width: 300px;
  height: 300px;
  position: absolute;
}

300x300px, span .

23. .child 20px .parent. ?

<body>
  <div class="parent">
    <div class="child">element 2</div>
  </div>
</body>

.parent {
  box-sizing: border-box;
  width: 1000px;
  padding: 20px;
}

.child {
  position: absolute;
}

. position: absolute , , top, right, bottom, left. .child 20px , position: absolute .

24. display ?

span {
  display: inline-block;
  position: relative;
}

inline-block, .. position: relative, display.

25. span ?

span {
  width: 300px;
  height: 300px;
  display: flex;
}

display: flex, . width height span. — 300x300px.

26. .child display inline-block. ?

<div class="parent">
  <span class="child">element2</span>
</div>

.parent {
  display: flex;
}

.child {
  display: inline-block;
}

. - . — block.

27. width .child . ?

<div class="parent">
  <div class="child">element2</div>
</div>

.parent {
  display: flex;
}

28. ?

<body>
  <div class="parent">
    <div class="first-child">element 1</div>
    <div class="second-child">element 2</div>
  </div>
</body>

.parent {
  display: flex;
  flex-direction: column;
}

.first-child {
  margin-bottom: 20px;
}

.second-child {
  margin-top: 10px;
}

30px, - .

29. .child ?

<div class="parent">
  <span class="child">element2</span>
</div>

.parent {
  display: flex;
  width: 250px;
  height: 250px;
}

.child {
  width: 100px;
  height: 100px;
  margin-top: auto;
  margin-left: auto;
}

150px.

B30 What are the sizes of the span element in the following example?

<div class="parent">
  <span class="child">element2</span>
</div>

.parent {
  display: flex;
}

.child {
  flex-basis: 250px;
  width: 100px;
  height: 200px;
  min-width: 150px;
  max-width: 225px;
}

Answer

225px. flex-basis width, min-width max-width. 250px (flex-basis) , 225px.

My favorite CSS questions with detailed answers

More articles: