HTML5: How to define a group of related options in a drop-down list?

Last update on August 19 2022 21:51:56 (UTC/GMT +8 hours)

Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>How to define a group of 
related options in a drop-down 
list</title>
</head>
<body>
<select>
<optgroup label="Computer 
Monitors">
<option value="crt">CRT</option>
<option value="lcd">LCD</option>
<option value="led">LED</option>
</optgroup>
<optgroup label="Computer 
Printers">
<option value="dot-matrix">Dot- 
Matrix</option>
<option value="ink-jet">Ink-
jet</option>
<option value="laser">Laser</option>
</optgroup>
</select>
</body>
</html>

Live Demo:

See the Pen ol-type-answer by w3resource (@w3resource) on CodePen.

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HTML-CSS: Tips of the Day

Should I size a textarea with CSS width / height or HTML cols / rows attributes?

I recommend to use both. Rows and cols are required and useful if the client does not support CSS. But as a designer I overwrite them to get exactly the size I wish.

The recommended way to do it is via an external stylesheet e.g.

HTML Code:

<textarea> </textarea>

CSS Code:

textarea {
  width: 300px;
  height: 150px;
}

Live Demo:

See the Pen html css common editor by w3resource (@w3resource) on CodePen.