HTML compatibilty of older version with newer version
We say that many tags that were supported in HTML4 are deprecated in HTML5. After the updation of html version, What i think is in doctype we will specify HTML4. But what if i want to include some features to my website which are not supported by the older version. Does that mean I will need to update the tags like bgcolor to background-color or is there a way to make the old written websites compatible with the newer version without having to make any changes?