How to Style Elements with CSS Class Names Starting with Numbers?

CSS Class Names Starting with Numbers: A Workaround

Despite CSS grammar prohibiting the use of class names that begin with numbers, cases arise where such class names exist in HTML documents. This article explores a workaround to make these names valid in CSS.

Problem Overview

According to CSS syntax, an identifier cannot start with an unescaped digit. Classes starting with numbers, such as '.000000-8', are therefore invalid.

Workaround

The workaround to make CSS classes with names that start with numbers valid involves escaping the digits.

By using the CSS escape sequence "", the digit can be converted into an escaped character. For example, the class name '.000000-8' can be expressed as:

<code class="css">. 00000-8 {background:url(../../images/common/000000-0.8.png);}</code>

or

<code class="css">.<pre class="brush:php;toolbar:false"><code class="css">. 00000-8 { ... }</code>

003000000-8 {background:url(../../images/common/FFFFFF-0.8.png);}

Example Usage

To use the escaped character in a CSS selector, simply prefix the leading digit with the escape sequence. For instance, the following selector would match an element with the class '000000-8':

Practical Considerations

Although this workaround solves the technical issue, it is generally not advisable to use class names that start with numbers. This can lead to confusion and make it difficult to maintain code. If possible, it is best to use alphanumeric class names without leading digits.

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