HTML5 tests - checking input types with JS

It is possible in most browsers to use JavaScript to detect support for specific input types. This page uses my script.

Script

I use the following script:

function supportsType(input) {
	var desiredType = input.getAttribute('type');
	var supported = false;
	if (input.type === desiredType) {
		supported = true;
	}
	input.value = 'Hello world';
	var helloWorldAccepted = (input.value === 'Hello world');
	switch (desiredType) {
		case "email":
		case "url":
			if (!input.validationMessage) {
				supported = false;
			}
			break;
		case "color":
		case "date":
		case "datetime":
		case "month":
		case "time":
		case "week":
			if (helloWorldAccepted) {
				supported = false;
			} 
			break;
	}
	return supported;
}

See this blog post for an explanation.