Does App.HTMLHeader Load for Each Page?

Does App.HTMLHeader Load for every WebPage (e.g. WebPage.Show) or only when the main page loads?
Trying to figure how I can define a Header and Footer once and use on every WebPage.

Thanks

App.HTMLHeader loads once, when the initial page and framework are delivered to the browser. Every page after that is delivered without a page reload.

Thank you!

Quick followup. Any way to create a common header with an image across all of my WebPages without duplicating the code on each page? i.e. like a re-usable component.

Use a WebContainer.

Perfect. Thanks