HTML5: How to specify that the dialog element is active and that the user can interact with it?

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HTML Code:

<!DOCTYPE html>;
  <meta charset="utf-8">
  <title>Example of the dialog element with open attribute :</title>
<table border="2">
    <th>March <dialog open>This is an open dialog window</dialog></th>

Live Demo:

See the Pen dialog-open-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.