title: What's the meaning of the font-weight integer values in CSS?
body: <p>In CSS it's possible to set the <code>font-weight</code> to <code>normal</code>, <code>bold</code>, <code>bolder</code>, <code>lighter</code>, <code>inherit</code> and plane integer values from <code>100-900</code>. Now my question is: Why are there such possible integer values? Why don't we have the listed property string values and who got that idea to use that integer values and why exactly these and not from <code>1-9</code>?</p>