Does HTML5 is necessary to make website or we can use the old version of HTML?
There are still many websites using older versions of html, browsers still support them. So it is not necessary to use html5.
Ok! What about version of CSS? can we use old version to make our website more compatible?
CSS is mostly added to as it progresses, so most of the old properties are still valid and will continue to be.
More compatible with what?
Old browsers that very few people are still using, or modern devices of varying sizes that are extremely popular?
I think by restricting yourself to old-style coding, there is a danger of excluding more people than you include.
I would not say RWD is impossible with only old CSS, but it will be much harder.
Ok! I appreciate your answer.
HTML 5 is basically just HTML 4 with some extra tags added so any page written as HTML 4 is also HTML 5.
HTML 5 also reintroduced a lot of the HTML 3.2 tags because most pages are still written in HTML 3.2 - so any page written in HTML 3.2 is also likely to be HTML 5.
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