improved readability of HEAD children

lib/single-file/htmlmini.js

@@ -197,7 +197,7 @@ this.htmlmini = this.htmlmini || (() => {
 				noWhitespace = element && noWhitespaceCollapse(element);
 			}
 			if ((!element || noWhitespace) && textContent.length > 1) {
-				node.textContent = textContent.replace(/[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+/g, " ");
+				node.textContent = textContent.replace(/[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+/g, node.parentElement && node.parentElement.tagName == "HEAD" ? "\n" : " ");
 			}
 		}
 	}