Simplify has("ie") detection.

wkeese · wkeese · commit 6b6da21bb28a · 2015-05-04T09:14:37.000+09:00
Trident is set for IE8+, so I removed some legacy code that was only needed for IE6-7.

Also, document.documentMode seems to be always set for IE8-11, even
without an x-ua-compatible &lt;meta&gt; tag, but I left in code to check
navigator.appVersion too, just in case it's needed for future
versions of IE.
diff --git a/sniff.js b/sniff.js
@@ -36,41 +36,20 @@ define(["./features"], function (has) {
 
 		has.add("wp", parseFloat(dua.split("Windows Phone ")[1]) || undefined);
 
-
 		// Browser detection
 		var webkit = parseFloat(dua.split("WebKit/")[1]) || undefined;
 		if (webkit) {
 			has.add("webkit", webkit);
 			has.add("chrome", parseFloat(dua.split("Chrome/")[1]) || undefined);
 			has.add("safari", dav.indexOf("Safari") >= 0 && !has("chrome") && !has("android") ?
 				parseFloat(dav.split("Version/")[1]) : undefined);
-		} else {
-			var isIE = 0;
-			if (document.all) {
-				// IE < 11
-				isIE = parseFloat(dav.split("MSIE ")[1]) || undefined;
-			} else if (dav.indexOf("Trident")) {
-				// IE >= 9
-				isIE = parseFloat(dav.split("rv:")[1]) || undefined;
-			}
-			if (isIE) {
-				// In cases where the page has an HTTP header or META tag with
-				// X-UA-Compatible, then it is in emulation mode.
-				// Make sure isIE reflects the desired version.
-				// Only switch the value if documentMode's major version
-				// is different from isIE's major version.
-				var mode = document.documentMode;
-				if (mode && Math.floor(isIE) !== mode) {
-					isIE = mode;
-				}
-
-				has.add("ie", isIE);
-			} else if (dua.indexOf("Gecko") >= 0) {
-				// Mozilla and firefox
-				has.add("mozilla", tv);
-				// We really need to get away from this. Consider a sane isGecko approach for the future.
-				has.add("ff", parseFloat(dua.split("Firefox/")[1] || dua.split("Minefield/")[1]) || undefined);
-			}
+		} else if (dav.indexOf("Trident") >= 0) {
+			// IE8+
+			has.add("ie", document.documentMode || parseFloat(dav.split("rv:")[1]));
+		} else if (dua.indexOf("Gecko") >= 0) {
+			// Mozilla and firefox
+			has.add("mozilla", tv);
+			has.add("ff", parseFloat(dua.split("Firefox/")[1] || dua.split("Minefield/")[1]) || undefined);
 		}
 	}
 
diff --git a/tests/functional/sniff.html b/tests/functional/sniff.html
@@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <html>
 	<head>
 		<meta http-equiv="content-type" content="text/html; charset=utf-8"/>

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+<!DOCTYPE html>`
`1`	`2`	`<html>`
`2`	`3`	`<head>`
`3`	`4`	`<meta http-equiv="content-type" content="text/html; charset=utf-8"/>`