幽靈空白節點存在于行框盒子的前面（必要條件 ：需要h5的文檔聲明）（表現形式：沒有寬度，永遠透明，不能通過腳本擷取）
因為有現成的提問和回答，是以将截圖摘于此。
原文位址：https://segmentfault.com/q/1010000014296346/a-1020000014298050
提問：
回答：
最後，感謝兩位前輩提供的精确回答。
附w3c規範：
Line boxes are created as needed to hold inline-level content within an inline formatting context. Line boxes that contain no text, no preserved white space, no inline elements with non-zero margins, padding, or borders, and no other in-flow content (such as images, inline blocks or inline tables), and do not end with a preserved newline must be treated as zero-height line boxes for the purposes of determining the positions of any elements inside of them, and must be treated as not existing for any other purpose.