CSS rules must include specified units

I am fairly new to CSS and have a question about specifying units in the code below. Without specifying units for height and width, the text fits on one line. However, once I add 'px', the text occupies two lines instead. Can anyone explain what happens when no units are specified?

HTML:

<figure class="hat">
  <img src="http://media.goorin.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/imports/products/100-3333-BLK-F01.png" width="100" height="100">
  <figcaption>A picture of a hat</figcaption>
</figure>

CSS:

.hat {
  position: relative;
  height: 100;
  width:100;
}
.hat figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

Answer №1

What happens when no units are specified?

No units are assigned. These declarations are considered invalid.

In CSS, any length value must have a unit unless it is 0.

By not specifying width and height in your code above, you essentially haven't defined them at all (in compliant browsers).

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