Proceedings of the International scientific and practical conference ― Cambridge Science and Education Conference‖ (February 23-25, 2026) / Publisher website: www.naukainfo.com. – Cambridge, United Kingdom, 2026. - 289 p.

110 When calculating the length of a selector by the number of characters, you can use the following expression: ( ) = ℎ( ) , (1) where L(S) – selector length; S – selector. The disadvantage of this approach is that some classes and IDs may have quite long names, which do not affect the operation of tests. Another problem may be the use of pseudo-classes, which are quite long. The next method involves determining the length of selectors by the number of components using the expression: ( ) = , (2) where n – number of components. The disadvantage of this approach is the inaccuracy of the result. After all, a selector component can consist of several parts. In particular, in our example, div.container is counted as one component, but it consists of two: the div tag and the .container class. Thus, this approach is not suitable for selectors that consist of one main component but are multi-component in nature. Now let's consider a method that uses weight coefficients to determine the length of the selector. This method is the most optimal because it takes into account the importance of each component of the selector. This is important because some components, such as id or class, are better for building a selector, while tags and nesting may be unnecessary in some cases. To calculate the length of the selector using weight coefficients, the following expression can be used: ( ) = ∑ ( ) =1 (3) where k – number of components; ( ) – the weight of each component, depending on its type. This approach makes it possible not only to reduce the length of the selector, but also to increase its stability, avoiding fragile and variable designs.