**BUG** Concise problem statement: When I have the easyeda.com site open (in editor or even when reporting this bug), Mac's Activity Monitor shows that Chrome is preventing sleep. This means the screen will turn off, but my laptop does not sleep to drains power quickly. Closing easyeda.com solves the problem. Steps to reproduce bug: 1. Open easyeda.com, e.g. the schematic editor, in Chrome on Mac laptop 2. Open Activity Monitor's energy tab and see Chrome is preventing sleep 3. Close all easyeda.com tabs and update Activity Monitor (e.g. by switching tabs) and Chrome no longer prevents sleep Results: easyeda.com causes Chrome to prevent my Mac laptop from sleeping. Expected results: My laptop should still be able to sleep if I have easyeda.com open Browser: Chrome Version 57.0.2987.133 (64-bit) on Mac