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What's the Purpose of the Backslash Character in CSS's ".container.31 2525"?
In the provided CSS code, the backslash character () serves a specific purpose related to identifier escaping. According to the CSS specification:
In the example:
.container.31 2525 is equivalent to .container[class ~= "125%"].
Therefore, the backslash escapes the percentage sign, allowing it to be treated as part of the identifier rather than a calculation. This technique ensures that the "125%" value is interpreted as a class name rather than a calculation.
Without the backslash, the identifier would start with a number and be invalid as per CSS syntax:
By using the backslash, the percentage values can be used as class names, enabling flexible styling based on container sizes.
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