What specific elements do square brackets in a CSS selector target within an HTML document?

Recently, I came across a CSS rule-set in a library:

[text-uppercase] {
   text-transform: uppercase;
}

I am intrigued by this and would like to implement it in a div

<div class="text-uppercase | [text-uppercase]"></div>

Unfortunately, neither method seems to be working for me. I'm encountering this issue while using ionic2.

Answer №1

In order for the specific selector to be effective:

<span uppercase-text></span>

The [uppercase-text] selector targets an attribute within a tag.

Answer №2

You didn't stumble upon a class, but rather came across something known as an attribute selector. This selector targets any HTML element with the specified attribute, regardless of its value. For example:

<section text-uppercase="true">
,
<div text-uppercase="something">
, <nav text-uppercase>

For more advanced usage cases, check out the reference provided in the link above.

[text-uppercase] {
  text-transform: uppercase;
}
<span text-uppercase>hello</span>

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