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    Firefox 26 for developers

    Firefox 26 was released on December 10, 2013. This article lists key changes that are useful not only for web developers, but also Firefox and Gecko developers as well as add-on developers.

    Want to help document Firefox 26? See the list of bugs that need to be written about and pitch in!

    Changes for Web developers

    CSS

    HTML

    • The HTMLSelectElement.selectedOptions property has been implemented (bug 596681).
    • In the <input> element of type email, values with domain labels longer than 63 chars are no more considered valid (bug 884332).
    • The HTMLInputElement.width and height properties now return 0 when the type is not image (bug 905240).
    • A <fieldset> element is now invalid, and can be styled using the :invalid pseudo-class, when one of the elements it contains is invalid (bug 717181).

    JavaScript

    EcmaScript 6 (Harmony) implementation continues!

    Interfaces/APIs/DOM

    MathML

    SVG

    • The inclusion of SVG glyphs inside OpenType, SVG-in-OpenType, has been updated to match the current version of the specification (bug 906521).
    • The SVGElement.ownerSVGElement() method doesn't throw anymore (bug 835048).

    Development tools

    See also

    Older versions

    Document Tags and Contributors

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    Contributors to this page: frankyan, fscholz, Luke314, ziyunfei, trlkly, janv, teoli, bbouvier, mc10
    Last updated by: teoli,