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It only checks if the first 1 minute of the video has subtitles or not, most trailers/etc have subtitles starting before the first 1 minute of the video, after that 1 minute of video has passed, or after a subtitle is found, the script stops running the checks.
This script uses the Tesseract OCR image recognition library to capture every frame of the first 1 minute of the video each second.
The 1-second delay was added to use a bit less CPU power.

Works on mobile browsers as well, but unless you have a powerful mobile device it is recommended that you use https://greasyfork.org.cn/en/scripts/479068-youtube-subtitle instead.