Shortening 0(unit) to 0 breaks declarations in some cases

[rinart73]

Input CSS:

textarea {
  border: 0px;
  padding: 10px 0px 12px 35px;
  transition: all 0s ease-in-out;
}

Code:

$input = file_get_contents('test.css');
$parser = new Parser();
$parser->setContent($input);
$stylesheet = $parser->parse();
echo $stylesheet;

Output CSS:

textarea {
 border: 0;
 padding: 10px 0 12px 35px;
 transition: all 0 ease-in-out
}

border and padding are valid, while transition is not. It doesn't work in browsers and doesn't pass W3 Validator.
From what I can see transition properties like transition-duration and transition-delay always require unit to be present, even if the value is 0. Not sure if there are other properties like this.

[tbela99]

this is perfectly valid, according to https://developer.mozilla.org/en-US/docs/Web/CSS/length#syntax

Specifying the length unit is optional if the number is 0

[tbela99]

"After a zero length, the unit identifier is optional." https://www.w3.org/TR/CSS22/syndata.html#length-units

[rinart73]

Please check in real browsers.
This is Chrome:

Firefox:

[rinart73]

Here is Mozilla docs:
https://developer.mozilla.org/en-US/docs/Web/CSS/transition-delay
https://developer.mozilla.org/en-US/docs/Web/CSS/time

The <time> data type consists of a <number> followed by one of the units listed below.
Units
s - Represents a time in seconds. Examples: 0s, 1.5s, -60s.
ms - Represents a time in milliseconds. Examples: 0ms, 150.25ms, -60000ms.

Although the number 0 is always the same regardless of unit, the unit may not be omitted. In other words, 0 is invalid and does not represent 0s or 0ms.

---

https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Types

Quantities such as length, angle can have unit omitted after 0.
While time, frequency and resolution should always have unit. CSS specs are weird.

[tbela99]

this seems like a bug to me. works perfectly fine in firefox but not in chrome based browsers

[rinart73]

It's not a Chrome bug. I tested it in Firefox too on windows.
The Mozilla specification states that certain value types can't omit unit from 0. I provided links above

[tbela99]

you are right :)