... means the stated width value is the total width of the content, the padding, and the border—in other words, the entire box (without the margin). To illustrate this, let’s return to the previous ... box-sizing sets the point of the element from which the width is calculated. The default is content-box, which means the stated width of the element applies to the content, and the padding and border ... box-sizing, so the stated width—150px—is the width of the content, and the border and padding are added to the content. In the second example, the value is border-box, meaning the 150px width...