Updated several package dependencies in the `package-lock.json` file to their latest versions, including `gulp`, `@puppeteer/browsers`, and many @rollup components. Added new dependencies such as `@gulpjs/messages`, `@rollup/freebsd`, and others to expand platform support. These changes aim to maintain compatibility, security, and improved features.

Introduced additional examples for parent/child DOM traversal and event propagation, including phases like capture and bubbling. Updated index.html to reference the new `event_2.md` file, highlighting expanded content on JavaScript events.