Answers for "html a tag retangular shape and color"

svg rect

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <rect width="100" height="100" x="50" y="50"/>
</svg>

tina4 shape html

echo _doctype()._html(
        _head(_title("Hello World!")),
        _body(
        _div(
        _h1("Hello World!",
            _b("Another tag",
                _p("Testing")
            )
        ),
        _p(["style" => "border: 1px solid red"], "This should have a red border")
        )));