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CSS Unused CSS Stages Transitions and Transforms 2D Transforms

2D Transforms Quiz Question

On the Which of the following will position the transform-origin at the bottom-right corner of an element? why isn't transform-origin: right bottom; considered a valid option?

<!DOCTYPE html>
  <meta charset="utf-8">
    html, body {
      width: 100%;
      height: 100%;
      margin: 0;

    .box {
      width: 90%;
      height: 90%;
      margin: 0 auto;
      background-color: #f0f0f0;

    .inner-box {
      background-color: lightblue;
      width: 100px;
      height: 100px;
      transform-origin: right bottom;
      transition: transform 1s;

    .box:hover .inner-box {
      transform: rotate(45deg);
  <div class="box">
    <div class="inner-box"></div>

changing transform-origin: right bottom; to transform-origin: 100% 100% gives me the same result on the browser.

1 Answer

Marko Koron
Marko Koron
20,658 Points

Because the order should be: bottom right for this answer to be correct.

According to the W3 Specification the value of the transform-origin is defined as:

[ left | center | right | top | bottom | <percentage> | <length> ]
  [ left | center | right | <percentage> | <length> ]
  [ top | center | bottom | <percentage> | <length> ] <length>?
  [ center | [ left | right ] ] && [ center | [ top | bottom ] ] <length>?

Applying the second rule, right bottom is a valid option.

Marko Koron
Marko Koron
20,658 Points

Yeah I know, I just tried in code in Codepen the two combinations "right bottom" and "bottom right" and it seems that both work so now I m also puzzled. I finished this lesson yesterday so I remember that the order int the video is top/bottom left/right.

I've finished it today and was curious why that option wasn't valid, tested the two options (the right bottom and 100% 100%) on my browser and both worked.

So I googled and found the W3 specification page and the Mozzila Developer page and in both the transform-origin: right bottom seems to be a valid option.

Marko Koron
Marko Koron
20,658 Points

Lol! I also did the same 'cause you got me thinking. I known that in the video uses the statement transform-origin: top right, but it seems that the order of keywords doesn't affect the result. Plus in the video is stated the first value should be the x-axis so it should be the left or right keyword following this logic.