What is the difference between this.clientWidth and this.offsetWidth_Basic knowledge

offsetWidth includes the width of the border clientWidth does not include

<table border="1"> <tr> <td onclick="alert(this.offsetWidth)">123123123</td> <td style="border:2px solid #ff0000 " onclick="alert(this.offsetWidth)">123123</td> <td onclick="alert(this.clientWidth)">123123</td> </tr> </table>
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