Can you spot the disparity between the following two CSS properties?
border-right: 1px dotted #CCCCCC;
Versus:
border-right: 1 px dotted #CCCCCC;
Is there a distinction between the two?
Is the second example incorrect? Should the number be directly next to px in CSS syntax?
"According to this specification, a length value (referred to as
<length>) consists of a<number>(with or without a decimal point) immediately followed by a unit identifier (e.g., px, em, etc.). The unit identifier becomes optional after a zero length."
Source: http://www.w3.org/TR/CSS21/syndata.html#length-units
To simplify, having a space before "px" is considered a syntax error. It is recommended to validate your CSS to ensure correctness.
According to the CSS guidelines:
The structure of a length value (indicated by
<length>in this document) is a<number>(with or without a decimal point) followed immediately by a unit identifier (like px, em, etc.). In the case of a zero length, the unit identifier may be omitted.
Therefore, the unit identifier should directly follow the number. Web browsers may interpret this rule differently, but it's best to adhere to the specifications when uncertain.
Cheers
It is important to note that when specifying border styles in CSS, precision is key.
For example, using "border-right: 1px dotted #CCCCCC;" is the correct way to define the style.
On the other hand, using "border-right: 1 px dotted #CCCCCC;" is incorrect due to the spacing issue. The space between the "1" and "px" causes confusion for the CSS interpreter, leading to errors in rendering the border.
Recently, while I was working on a WordPress project, I ran into an issue with a media query that seemed to be completely ignored. It took me nearly an hour of frustration to finally realize what the problem was. I had accidentally left a space before the "px" in my CSS code (for example: "648 px" instead of "648px").
My advice to others facing similar problems is to always double-check for any unnecessary spaces, even though they may work fine most of the time.
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