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    Chrono is a simple chronometer with a lap counter, built to highlight various aspects of the open web app development process.

    View on the Firefox Marketplace.
    Read the full developer walkthrough.

    Difficulty: Easy

    Code Breakdown:

    • 7% HTML
    • 11% CSS
    • 82% JavaScript



    Web API Usage

    Chrono does not require a network connection to run.
    Open Web Apps
    Uses the Open Web Apps installation API to allow installation on the device independently on Marketplace.

    Custom Elements

    Gaia Building Blocks
    Chrono uses the same UI components as the built-in apps.

    Third-party Libraries

    Uses a volo.js script to optimize app before release, i.e. by auto-generating an appcache manifest.
    Uses jQuery to simplify common tasks such as DOM manipulation.
    Uses RequireJS to split JavaScript code into more easily maintainable modules.

    Document Tags and Contributors

    Contributors to this page: chrisdavidmills, cvan, georgialyle
    Last updated by: cvan,