Function _fnBrowserDetect

external/.datatables.js:1824–1875

* Browser feature detection for capabilities, quirks * @param {object} settings dataTables settings object * @memberof DataTable#oApi

(settings)

	 *  @memberof DataTable#oApi
	 */
	function _fnBrowserDetect(settings) {
		// We don't need to do this every time DataTables is constructed, the values
		// calculated are specific to the browser and OS configuration which we
		// don't expect to change between initialisations
		if (!DataTable.__browser) {
			var browser = {}
			DataTable.__browser = browser

			// Scrolling feature / quirks detection
			var n = $("<div/>")
				.css({
					position: "fixed",
					top: 0,
					left: -1 * window.pageXOffset, // allow for scrolling
					height: 1,
					width: 1,
					overflow: "hidden"
				})
				.append(
					$("<div/>")
						.css({
							position: "absolute",
							top: 1,
							left: 1,
							width: 100,
							overflow: "scroll"
						})
						.append(
							$("<div/>").css({
								width: "100%",
								height: 10
							})
						)
				)
				.appendTo("body")

			var outer = n.children()
			var inner = outer.children()

			// Get scrollbar width
			browser.barWidth = outer[0].offsetWidth - outer[0].clientWidth

			// In rtl text layout, some browsers (most, but not all) will place the
			// scrollbar on the left, rather than the right.
			browser.bScrollbarLeft = Math.round(inner.offset().left) !== 1

			n.remove()
		}

		$.extend(settings.oBrowser, DataTable.__browser)
		settings.oScroll.iBarWidth = DataTable.__browser.barWidth
	}

	/**
	 * Add a column to the list used for the table with default values