Mat-video caption button not showing on any browser.

I have created video player using mat-video angular material tag.

My video has been working properly but my track tag not showing caption button on any browser.

Below is my code:

<mat-video #matvideo src=“http://bit.ly/can-tom-n-jerry”>
<tracksrc="…/assets/dw_trailer_low.vtt"
kind=“subtitles”
srclang=“en”
label=“English”
default
/>

Sorry, your browser doesn’t support embedded videos.

I am using angular cli 8 version and npm 6.10.0

Any help on this is much appreciated.

Thanks,

(You might get an answer here, but because this forum is focused on npm, you might want to ask your question somewhere that targets experts with your package. I have moved your topic to #community:javascript.)