Is JavaScript or Flash more commonly used for online video players, and what are the advantages and disadvantages of each in terms of security?

JavaScript is more commonly used for online video players due to its compatibility with modern web browsers and mobile devices. However, Flash was previously popular for video playback before being phased out due to security vulnerabilities and lack of support. JavaScript offers better security as it runs within the browser sandbox, while Flash has a history of security flaws that can expose users to malware and cyber attacks.

// No PHP code snippet provided as this issue pertains to client-side technologies like JavaScript and Flash.