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In modern front end web development, there are three main components.
The contents of your page, the style, IE how it looks, and its behavior.
Each of these have an associated language with them.
HTML for the markup and content, CSS for the style and
CSS can't reach: the window.
A browser has a special object called the window object, which contains lots of
information about the current browser window, like the current location,
the URL, the webpage or the document that you've got open, to even the program or
application code you've written.
you couldn't programmatically access the window, and it's current document.
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