CSS is a powerful tool 9L0-402 that gives web designers flexibility and modularity in the presentation layer of a web site.
CSS allows you to have every format rule defined for later use (here "format" means how things appear). So if you are writing a large website and you want a consistent appearance for every title, sub-title, how examples of code appear, how paragraphs are aligned, (I could go on, CSS covers a wide range of presentation options) then CSS is the way to go.
Let's say you have a 1200 page website that took you months to complete. Your current boss gets a promotion and another 9L0-509 person fills his place. Your new boss says to change the font, the size, the background, the appearance of tables, etc. everywhere on your 1200-page site to comply with some new corporate policy
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