<!-- CSS 2.1 Reference

Property Name: font-weight

This property specifies how 'bold' text within the element will be. The numeric value of 400 is the equivalent of the named value normal, while the value of 700 is the equivalent of the named value of bold. Generally, browser support varies for other values, either numeric or named, so normal and bold should be used in most cases. The relative values of lighter and bolder apply the next level, either less bold or more bold, relative to the parent element. When using one of those two relative values, you should check the result on various browsers and platforms, as they will usually produce different results.