Are CSS property values ​​applicable to a unit of value with zeros added equivalent to the corresponding non-zero values?

Question

I was looking at some stylesheets when I noticed one that I used linear-gradientwith rgba()color stops, in which numbers rgbaused multiple instances of 0 instead of one 0

background-image:linear-gradient(to top left, rgba(000,000,000,0.1),rgba(100,100,100,1));

I have not seen several zeros (instead of one zero) occupying one slot in the rgb / a color space before, but confirmed in CodePen, this is valid. Then I looked at the definition of the W3C number here .

To make a long story short, after some pushing and digging, I did not understand that I could bring an indefinite number of zeros to length and get the same result as without zeros, like this:

/* The two squares generated have equivalent width and height of 100px - for giggles, I also extended the same idea to the transition-duration time */

<style>

div.aaa {
    width:00000000100px;
    height:100px;
    background-image:linear-gradient(to top left,rgba(000,000,000,0.1),rgba(100,100,100,1));
    transition:1s cubic-bezier(1,1,1,1)
}

div.bbb {
    width:100px;
    height:000000000000000000000000000000000100px;
    background-color:green;
    transition:0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001s cubic-bezier(1,1,1,1)
}

div:hover { background-color:red } 

</style>

<div class="aaa"></div>
<div class="bbb"></div>

It is difficult to directly verify that these numbers are equivalent representations, since using the scripting language:

/* PHP */
$x = 100;
$y = 00000000000100; // problem is PHP treats this as an octal number

echo ($x == $y) ? 'true' : 'false'; // echoes the string ---> false

/* Javascript */
var x = 100;
var y = 00000000000100; // also treats this as an octal number

var res = (x == y) ? 'true' : 'false';
alert(res); // alerts ---> false

These examples tell me that CSS does not process, for example. 0000100 as an octal number, but rather as a decimal (or at least not octal numbers), since the value width, heightand transition-durationfor the elements generated above, the html seems to be the same.

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Answer 1

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https://www.w3.org/TR/CSS21/syndata.html

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css 3 spec: https://www.w3.org/TR/css3-values/#numbers

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