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Demo

Change a rule on the left and the component on the right gets the new attribute and re-checks the file you chose. Below are the HTML for the current settings and the event log.

Rules

Allowed formats

The demo upload server does not store the file; it replies with the size it received. With upload off, the file never leaves this browser.

State: idle

HTML for these settings

Event log
Choose a file and events show up here.
Attributes and events docs · Upload and forms docs