Defines the weight of the text.

默认属性 font-weight: normal;

The text is in normal weight.

font-weight: bold;

The text becomes bold.

font-weight: 600;

You can use numeric values. They all correspond to a particular named weight:

  • 100 Thin
  • 200 Extra Light
  • 300 Light
  • 400 Normal
  • 500 Medium
  • 600 Semi Bold
  • 700 Bold
  • 800 Extra Bold
  • 900 Ultra Bold

If the font family doesn't provide the requested weight, it will use the closest available one.

font-weight: lighter;

You can use relative keywords: lighter or bolder. The browser will use the next available weight.