DevTools Tips

Prototype content changes with designMode

When creating or modifying a design prototype for the web, you may want to quickly edit content in the browser without having to find the relevant code.

When you turn on designMode for the document or a given element, all associated text becomes editable directly in the browser. Images and other page content can be deleted, too. This is a quick way to prototype design changes such as seeing how a page responds to very long or very short headline copy.

designMode is not a DevTools-specific feature, as it is defined as part of the Web API. However, toggling designMode via the DevTools Console is a convenient way to temporarily make the page editable.

  • Open the Console
  • Enter document.designMode="on" and press Enter

Turn off designMode with the expression document.designMode="off".

In Polypane these steps are not neede and it's enough to open the Debug tools and activating Edit content.

Changes are not persisted and will revert on page close or refresh.

Animation of editable web page with designMode on.