1. Font Size

• 1px(Pixel)
  • 1/96 inch
  • 0.26mm
• 1pt(Point)
  • 1/72 inch
  • 0.35mm
  • in word
• 1em()
  • 100% of parent
• 1rem 推荐
  • 100% of root

2. Font Weight

• 关键词
  • normal
  • bold
• Relative to Parent
  • lighter
  • bolder
• 数字
  • 100-900

3. Font Family

• Helvetica is sans serif
• Times New Roman is serif

h1 {
    font-family: Helvetica,sans-serif
}

h1 {
    font-family: "Times New Roman",sans-serif
}

• fonts.google.com

4. Text Align

h1 {
    text-align:center
}