Developers who want to use the same markup today across different browsers rely on plug-ins. I'm honestly not sure what they mean by this, either the writer ha

Developers who want to use the same markup today across different browsers rely on plug-ins. I'm honestly not sure what they mean by this, either the writer has not expressed his thoughts clearly or there is a severe issue here. Developers who want to use the same markup across different browsers rely on standards. Each browser supports a sub-set of the complete HTML, JS & CSS standards and the technologies that developers use is, for the most part, the lowest common denominator of that subset for the browsers they are targeting. Plugins come into their own when you are trying to do something that falls outside the capabilities of the lowest common denominator (Silverlight & Flash being good examples), but they should not be relied upon for the 'bread & butter' of the web, HTML & CSS.