monaco-editor/test/manual/samples/run-editor-failing-js.txt

var container = document.getElementById("container");
var cssCode = [
	'body {',
	'	margin: 0px;',
	'	padding: 0px;',
	'}'
].join('\n');

Monaco.Editor.create(container, {
	value: cssCode,
	mode: "text/css"
});

require(['vs/platform/platform', 'vs/editor/modes/modesExtensions'], 
	function (Platform, ModesExtensions) {
		var modesRegistry = Platform.Registry.as(ModesExtensions.Extensions.EditorModes);
		
		// Try 'ignore', 'warning', and 'error'
		modesRegistry.configureMode('text/css', {
			"validationSettings": {
				"lint": {
					compatibleVendorPrefixes": "warning",
					vendorPrefix": "warning",
					duplicateProperties": "warning",
					emptyRules": "warning",
					importStatement": "ignore",
					boxModel": "ignore",
					universalSelector": "warning",
					zeroUnits": "ignore",
					fontFaceProperties": "warning",
					hexColorLength": "error",
					argumentsInColorFunction": "error",
					unknownProperties": "warning",
					unknownVendorSpecificProperties": "warning",
					propertyIgnoredDueToDisplay": "warning",
					important": "ignore",
					float": "ignore",
					idSelector": "ignore"
				}
			}
		});
	}
);