vendor/emmet.js
function findPrefixes(property, noAutofill) {
		var result = [];
		_.each(vendorPrefixes, function(obj, prefix) {
			if (hasPrefix(property, prefix)) {
				result.push(prefix);
			}
		});
		
		if (!result.length && !noAutofill) {
			// add all non-obsolete prefixes
			_.each(vendorPrefixes, function(obj, prefix) {
				if (!obj.obsolete)
					result.push(prefix);
			});
		}
		
		return result;
	}
function findPrefixes(property, noAutofill) {
		var result = [];
		_.each(vendorPrefixes, function(obj, prefix) {
			if (hasPrefix(property, prefix)) {
				result.push(prefix);
			}
		});
		
		if (!result.length && !noAutofill) {
			// add all non-obsolete prefixes
			_.each(vendorPrefixes, function(obj, prefix) {
				if (!obj.obsolete)
					result.push(prefix);
			});
		}
		
		return result;
	}
Search for a list of supported prefixes for CSS property. This list
is used to generate all-prefixed snippet
@param {String} property CSS property name
@returns {Array}