No tool will write good CSS selectors for you, just like no tool can write good code for you. Yes, you can generate code from templates, but only for the most repetitive coding tasks. CSS is more art than science, and so the “automatic generation” will not produce good results.
Writing good, clean, lean, supported CSS requires a deep knowledge of the HTML markup, style and layout you are trying to achieve, and the ability to identify templates throughout the site, such as font, color, h1 headers, presentation of tabular data, etc., which are reused.
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