<!-- - Thanks for opening an issue for us! Before you open an issue, - please check if a similar issue exists or has been closed before. - - If you're asking a question about how to use Blockly in your application, - please ask questions on the mailing list, instead of filing issues: - https://groups.google.com/forum/#!forum/blockly --> ### Problem statement <!-- TODO: Please describe the problem. - Is it a bug report (something didn't work the way you expected), - or a feature request (something new you think would improve Blockly)? --> ### Expected Behavior <!-- TODO: Please describe what should happen. - Include screenshots if applicable. --> ### Actual Behavior <!-- TODO: Describe what actually happens. - Include screenshots if applicable. --> ### Steps to Reproduce <!-- TODO: Explain what someone needs to do in order to see - what's described in *Actual behavior* above --> 1. Start by.. 2. Next, do.. ### Stack Traces <!-- TODO: Please open up the console. If you see any Blockly-related errors, - paste them between the quotes below. - - Ignore any instances of... - "Uncaught (in promise) DOMException: The play() request was interrupted by a call to pause()." --> ``` Replace with error stack trace. ``` ### Operating System and Browser <!-- TODO: If this issue is browser specific, uncomment the systems you have tested. --> <!-- * Desktop Chrome --> <!-- * Desktop Firefox --> <!-- * Desktop Safari --> <!-- * Desktop Opera --> <!-- * Windows Internet Explorer 10 --> <!-- * Windows Internet Explorer 11 --> <!-- * Windows Edge --> <!-- * Smartphone/Tablet/Chromebook (please complete the following information): * Device: [e.g. iPhone6] * OS: [e.g. iOS8.1] * Browser [e.g. stock browser, safari] * Version [e.g. 22] --> ### Additional Information <!-- Anything else we should know? -->