Automatically convert first letter to upper case in HTML

[doqgmui]

How do I convert all the
first letter of new line or
first letter after the dot ( . ) or
first letter after a space followed by a dot ( . )

in HTML with h1, h2, h3, h4, h5, h6, and p elements only?

For example:

1. Hello
2. …ending.Hello
3. …ending. Hello