← DictionaryViewport
The visible area of a page in a given browser window or device screen.
The window the visitor is looking through.
What It Is
In the BWH map, Viewport lives under Website — Layout. In practice it means this: the visible area of a page in a given browser window or device screen.
It is a label with a settled working definition, so the value is in using it the same way every time. Keep it that plain and it will still be true in twelve months.
How It's Used
You will usually meet Viewport in site builds, page structure and the technical decisions underneath them. It normally appears alongside Breakpoint, Responsive Design and Above the Fold. The practical test is whether everyone in the room means the same thing by it.
Why It Matters
Viewport is cheap to get right early and awkward to fix late. When it is unclear, the site still launches — it just quietly underperforms. Clarity here removes a surprising amount of downstream argument.
Picture a word everyone in the room has agreed to use the same way. The window the visitor is looking through.
Termshift™
How the meaning shifts depending on who is using it, and where.
Professionally, Viewport carries the narrow meaning: the visible area of a page in a given browser window or device screen.
Explained to someone with no marketing background, Viewport is the window the visitor is looking through.
The Bottom Line
Keep Viewport plain: the window the visitor is looking through. That is the version that holds up in a real project.