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• Documentation issue

Q69. The CSS box model describes how the parts of a CSS box fit together and the size of the box. What is the actual width of the following box's visible part under the standard box model?

box {
  width: 200px;
  padding: 10px;
  margin: 0 15px;
  border: 2px 5px;
}

• 230px
• 220px
• 200px
• 260px

The question is way too ambiguous. It did not specify whether the box border is considered to be part of the "visible part of the box".