1 . MARQUEE TAG

->  Marquee tag is the one of the most underrated tag in html
->  It automatically scroll text/images horizontally/vertically continously
->  The main attribute it takes is the direction (up/down/left/right)

Code snippet :

  <marquee direction = "left">I'm scrolling left</marquee>
  <marquee direction = "right">I'm scrolling right</marquee>

Preview:

2 . LEGEND TAG

  -> legend is yet another underrated tag in html
  -> It defines the caption for the field-set element

Code snippet :

  <fieldset>
    <legend><h1>Dev details</h1> </legend>
    <label>Name :</label> <input type="text"/><br/>
    <label>skills :</label> <input type="text"/><br/>
    <label>projs :</label> <input type="text"/><br/>
  </fieldset>

Preview:

3 . PROGRESS TAG

    ->  Progress tag is yet another inderrated tag in HTML
    ->  It easily creates progress bars in HTML
    ->  The important attributes are value and max

Code snippet :

<progress value="50" max="100">50%</progress>

Preview: