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> That initial value is the same for all elements across the entire web. The initial value of display is inline, and the initial value of every margin property

• masswerk 4y ago
  That is before any default or user styles are applied, which are in turn overwritten by author styles. (Think of the default values of a base object or base class, which are then overwritten by the constructor or more specific methods.)
• minitech 4y ago
  The three paragraphs that follow explain, including > This is why we need browser styles, which provide different defaults from one element to the next. Some elements should be display: block (divs, paragraphs, lists, headings, etc), and some of those elements should have margins on them to improve readability. If you apply the rule h1 { display: initial; margin: initial; } you’ll get an inline h1 with no margin.
• nightpool 4y ago
  This is the difference between the *initial* value, which is the SAME for all elements, and the *default* value, which is based on the user-agent stylesheet. Every property has one single "initial" value, which doesn't change from element to element, but can get overridden by the user-agent for individual elements.