Fix the domMock and domMock tests for cssText support

test-utils/domMock.js

@@ -136,7 +136,11 @@ module.exports = function() {
 					get style() {
 						return style
 					},
-					set style(value) {
+					set style(_){
+						// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/style#Setting_style
+						throw new Error("setting element.style is not portable")
+					},
+					set cssText(value) {
 						if (typeof value === "string") {
 							for (var key in style) style[key] = ""
 							var rules = value.split(";")

test-utils/tests/test-domMock.js

@@ -474,20 +474,30 @@ o.spec("domMock", function() {
 
 			o(typeof div.style).equals("object")
 		})
-		o("setting style string works", function() {
+		o("setting cssText string works", function() {
 			var div = $document.createElement("div")
-			div.style = "background-color: red; border-bottom: 1px solid red;"
+			div.cssText = "background-color: red; border-bottom: 1px solid red;"
 
 			o(div.style.backgroundColor).equals("red")
 			o(div.style.borderBottom).equals("1px solid red")
 		})
-		o("removing via setting style string works", function() {
+		o("removing via setting cssText string works", function() {
 			var div = $document.createElement("div")
-			div.style = "background: red;"
-			div.style = ""
+			div.cssText = "background: red;"
+			div.cssText = ""
 
 			o(div.style.background).equals("")
 		})
+		o("setting style throws", function () {
+			var err = false
+			try {
+				div.style = ''
+			} catch (e) {
+				err = e
+			}
+
+			o(err instanceof Error).equals(true)
+		})
 	})
 	o.spec("events", function() {
 		o.spec("click", function() {