Which property is used to detect the browser’s user agent and code based on the pertinent cases?

Some users have requested tests for IE’s float double margin bug, and support for position:fixed. Which API is suitable for them?

___________ is an open source JavaScript library that allows support for different levels of experiences based on the capabilities of each browser.

____________ allows you to add custom styles to the document and test an element afterwards.

Modernizr does actually add missing functionalities to browsers save for the HTML5 tags styling support.

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