The behavior of CSS classes, unique characters, and the usage of class prefixes

I'm dealing with a template that contains some puzzling CSS selectors.

The syntax in question is as follows:

.\35 grid .\31 1u { width: 91.5%; }
, but the '\' character appears as a strange symbol in Notepad++. Can someone explain how this is being interpreted? The class appears to be associated with '5grid'.

Additionally, I've observed a naming convention where classes are prefixed with "do-classX". When applied to an element, the class is set as 

<element class="classX"></element>
and the styling is applied. Is there some sort of mapping for the class names? How does the browser understand which class to apply the styling to?

This is really confusing me...

jqueryhtmlcss

Answer №1

It is important to note that CSS selectors cannot begin with a number. To work around this restriction, some developers use an "escaping" technique to create a valid selector.

For instance, consider this HTML snippet:

<a class="9">Link</a>

To select this element, you can use the following approach:

.\39 {

}

If you are interested in learning more about this topic, Ben Frain has written an informative article on numbers in ID and class names:

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