Answers for "html minimum length"

html minimum width

.wrapper {
  width: 100%;
  min-width: 20em; /* Will be AT LEAST 20em wide */
}

Validate length with html

<--html forms min. charcter-->
<input pattern=".{3,}"   required title="3 characters minimum">
<input pattern=".{5,10}" required title="5 to 10 characters">