Google employs "CSS-in-JS" or similar build tools that compile human-readable styles into short, randomized strings like wMrRB1O3 . This serves two main purposes:
The CSS selector .wMrRB1O3 is a used by Google Search to style specific elements within its search results layout. Context and Usage
: Shorter class names reduce the overall size of the HTML and CSS files, leading to faster page loads.