Semantic HTML

Below you will find examples for the "O" tags.

Definitions

<Object>
The <object> tag is used to embed an external application or interactive content into an HTML document. Examples include PDF, video, and audio files.

Image

Video

HTML Page

Note that there are <img>, <video>, <iframe> tags that do specific embeddings and <object> is a generic solution.
<ol>
The <ol> tag is used to create an ordered list. Ordered lists are lists where each item in the list is numbered.
  1. First Item
  2. Second Item
  3. Third Item
<optgroup>
The <optgroup> tag is used to group related options in a drop-down list.
<option>
The <option> tag is used to define an option in a drop-down list.