HTML : How to automatically expand html select element in javascript

HTML : How to automatically expand html select element in javascript
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I have a hidden feature that I promised to tell you about.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
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The progress bar on YouTube will be altered to a flashing rainbow.

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HTML : How to automatically expand html select element in javascript
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