Support Queries
Build fallback stylesheets with Feature Queries, so older browsers get a layout that works too.
Support Queries (Advanced)
The Design For toolbar icon activates Feature Queries — fallback stylesheets that let you build for older browsers too.
Adding Support for a Feature Query
Feature queries test whether a browser understands a CSS feature. Create one from the Choose a new support query dropdown.
Activating a Feature Query
Two ways to switch a query on: the pen icon in the Support Query dialog, or the Design For dropdown in the Style pane.
Fallback First — Progressively Enhance
The default Design For mode applies styles to all browsers. Build the base there, then enhance with the other queries.