Block-level elements: block-level, I believe everyone knows it (or Google it). When I was writing code in the past, I always felt strange when facing the

• tag. Why can it set the height, but unlike the

  elements, it feels like it is a "semi-inline" (inline: inline[text]-level) element. HTML 4 is described like this:
  

  The following elements may also be considered block-level elements since they may contain block-level elements:

  This description seems to be saying that <li /> is a "semi-inline" element. Of course, elements similar to <td /> in this list have also caused me such doubts. Today I took a look at the default CSS of each browser. The result is this:

  ##IE8+ / Webkit / Firefox / Opera

  Browsers	CSS
  IE6/IE7	li{<a href="//m.sbmmt.com/wiki/927.html" target="_blank">display</a>:block;}
  	li{display:list-item;}

  Here, it’s basically clear. In A-Grade browsers other than IE6/7, it is a "semi-inline" element. Mentioning

  display:list-item;, in fact, even though all A-Grade browsers now support it, not many people use it. Why? In fact, it is of no use. In Quirks Mode, PPK says this:
  

  display: list-item means that the element is displayed as a list-item, which mainly means that it has a bullet in front of it (like an UL), except in IE 5 on Mac where it gets a number (like an OL). The numbers are buggy: all previous LI's in the page count as one, so this example starts with number 5 (the screenshot was made before I inserted my compatibility-LI's).

  Live example:

  display: block

  display: list-item

  display: list-item

  Right. In fact, this does not mean much. But it can be regarded as solving one of my doubts. Share it. If you also have such doubts, maybe if a bug or other question arises next time when coding, you will probably be able to respond quickly.

• DD – Definition description

• DT – Definition term

• FRAMESET – Frameset

• LI – List item

• TBODY – Table body

• TD – Table data cell

• TFOOT – Table foot

• TH – Table header cell

• THEAD – Table head

• TR – Table row

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