Specifying Font and Size in HTML table
First, try omitting the quotes from 12 and 24. Worth a shot.
Second, it's better to do this in CSS. See also http://www.w3schools.com/css/css_font.asp . Here is an inline style for a table tag:
<table style='font-family:"Courier New", Courier, monospace; font-size:80%' ...>...</table>
Better still, use an external style sheet or a style tag near the top of your HTML document. See also http://www.w3schools.com/css/css_howto.asp .
This worked for me and also worked with bootstrap tables
<style>
.table td, .table th {
font-size: 10px;
}
</style>
Enclose your code with the html and body tags. Size attribute does not correspond to font-size and it looks like its domain does not go beyond value 7. Furthermore font tag is not supported in HTML5. Consider this code for your case
<!DOCTYPE html>
<html>
<body>
<font size="2" face="Courier New" >
<table width="100%">
<tr>
<td><b>Client</b></td>
<td><b>InstanceName</b></td>
<td><b>dbname</b></td>
<td><b>Filename</b></td>
<td><b>KeyName</b></td>
<td><b>Rotation</b></td>
<td><b>Path</b></td>
</tr>
<tr>
<td>NEWDEV6</td>
<td>EXPRESS2012</td>
<td>master</td><td>master.mdf</td>
<td>test_key_16</td><td>0</td>
<td>d:\Program Files\Microsoft SQL Server\MSSQL11.EXPRESS2012\MSSQL\DATA\master.mdf</td>
</tr>
</table>
</font>
<font size="5" face="Courier New" >
<table width="100%">
<tr>
<td><b>Client</b></td>
<td><b>InstanceName</b></td>
<td><b>dbname</b></td>
<td><b>Filename</b></td>
<td><b>KeyName</b></td>
<td><b>Rotation</b></td>
<td><b>Path</b></td></tr>
<tr>
<td>NEWDEV6</td>
<td>EXPRESS2012</td>
<td>master</td>
<td>master.mdf</td>
<td>test_key_16</td>
<td>0</td>
<td>d:\Program Files\Microsoft SQL Server\MSSQL11.EXPRESS2012\MSSQL\DATA\master.mdf</td></tr>
</table></font>
</body>
</html>