Colibrio Reader Framework API - Cloud license
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    interface IEpubMediaOverlayOptions {
        activeElementAncestorClass?: string;
        activeElementStylesOverride?: { [property: string]: string };
        fallbackActiveElementClass?: string;
        fallbackPlaybackActiveClass?: string;
    }

    Properties

    activeElementAncestorClass?: string

    CSS class name to apply to ancestor elements for the currently playing EPUB Content Document element.

    A value of null means this feature is not used.

    null
    
    activeElementStylesOverride?: { [property: string]: string }

    Replaces all publication defined styles used for the active element during MediaOverlay playback.

    The style declarations added with this option are not affected by IPublicationStyle.paletteOptions

    null
    
    fallbackActiveElementClass?: string

    Fallback CSS class name to apply to the currently playing EPUB Content Document element, if the OPF document does not specify any such class.

    -epub-media-overlay-active
    
    fallbackPlaybackActiveClass?: string

    Fallback CSS class name to apply to the EPUB Content Document's document element when playback is active, if the OPF document does not specify any such class.

    -epub-media-overlay-playing