I've recently taken over the management of a website and I came across some unfamiliar CSS syntax.
Has anyone encountered this type of syntax before? Can someone explain what the square brackets inside a style represent?
Thank you, Rob
.trigger-txt-left {
color: #0455A3;
font-family: 'OpenSans';
float: left;
font-size: 16px;
font-weight: bolder;
width: 235px;
[font-family: 'OpenSans';
font-family: 'HelveticaNeue-Bold';]
[font-weight: bolder;
font-weight: normal;]
}
In actuality, these CSS properties are not valid.
One could speculate that the individual may have been using a code snippet to dynamically choose the correct property elsewhere, such as in PHP where the [ and ] characters are parsed out to select the desired property.
Alternatively, it's possible that the person overlooked using the /* */ style comments or perhaps they believed they were being clever by intentionally making it invalid in that manner.
However, it is more probable that this was simply a mistake, potentially copied and pasted from another source.
In summary: The CSS provided is not valid
To determine the validity of this CSS code, referencing the official CSS specification may be beneficial. According to the CSS spec on Declarations and properties, it states that "A property name is an identifier." Additionally, the section on identifiers syntax clarifies:
CSS identifiers (element names, classes, and IDs in selectors) are restricted to characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, along with hyphens (-), underscores (_), and escaped characters. They cannot begin with a digit or specific sequences like two hyphens or a hyphen followed by a digit. Identifiers may also include any ISO 10646 character as a numeric code.
After referencing the Unicode character table, it becomes evident that the use of the character `[` is not permitted within identifiers. Consequently, the identifier used in this case for a CSS property within a block `font-family: 'OpenSans'; font-family: 'HelveticaNeue-Bold';` is considered invalid.
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