scroll-behavior-polyfill
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    2.0.13 • Public • Published
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    A polyfill for the 'scroll-behavior' CSS-property

    Downloads per month NPM version Dependencies Contributors code style: prettier License: MIT Support on Patreon

    Description

    The scroll-behavior CSS-property as well as the extensions to the Element interface in the CSSOM View Module CSS property sets the behavior for a scrolling box when scrolling is triggered by the navigation or CSSOM scrolling APIs. This polyfill brings this new feature to all browsers.

    It is very efficient, tiny, and works with the latest browser technologies such as Shadow DOM.

    This polyfill also implements the extensions to the Element interface in the CSSOM View Module such as Element.prototype.scroll, Element.prototype.scrollTo, Element.protype.scrollBy, and Element.prototype.scrollIntoView.

    Features

    • Spec-compliant
    • Tiny
    • Efficient
    • Works with the latest browser technologies, including Shadow DOM
    • Seamless

    Table of Contents

    Install

    NPM

    $ npm install scroll-behavior-polyfill
    

    Yarn

    $ yarn add scroll-behavior-polyfill
    

    Applying the polyfill

    The polyfill will be feature detected and applied if and only if the browser doesn't support the property already. To include it, add this somewhere:

    import "scroll-behavior-polyfill";

    However, it is strongly suggested that you only include the polyfill for browsers that doesn't already support scroll-behavior. One way to do so is with an async import:

    if (!("scrollBehavior" in document.documentElement.style)) {
        await import("scroll-behavior-polyfill");
    }

    Alternatively, you can use Polyfill.app which uses this polyfill and takes care of only loading the polyfill if needed as well as adding the language features that the polyfill depends on (See dependencies).

    Usage

    Declarative API

    You can define the scroll-behavior of Elements via one of the following approaches:

    • A style attribute including a scroll-behavior property.
    • An element with a scroll-behavior attribute.
    • Or, an element with a CSSStyleDeclaration with a scrollBehavior property.

    This means that either of the following approaches will work:

    <!-- Works just fine when given in the 'style' attribute -->
    <div style="scroll-behavior: smooth"></div>
    <!-- Works just fine when given as an attribute of the name 'scroll-behavior' -->
    <div scroll-behavior="smooth"></div>
     
    <script>
        // Works jut fine when given as a style property
        element.style.scrollBehavior = "smooth";
    </script> 

    See this section for information about why scroll-behavior values provided in stylesheets won't be discovered by the polyfill.

    Imperative API

    You can of course also use the imperative scroll(), scrollTo, scrollBy, and scrollIntoView APIs and provide scroll-behavior options.

    For example:

    // Works for the window object
    window.scroll({
        behavior: "smooth",
        top: 100,
        left: 0
    });
     
    // Works for any element (and supports all options)
    myElement.scrollIntoView();
     
    myElement.scrollBy({
        behavior: "smooth",
        top: 50,
        left: 0
    });

    You can also use the scrollTop and scrollLeft setters, both of which works with the polyfill too:

    element.scrollTop += 100;
    element.scrollLeft += 50;

    Dependencies & Browser support

    This polyfill is distributed in ES3-compatible syntax, but is using some modern APIs and language features which must be available:

    • requestAnimationFrame
    • Object.getOwnPropertyDescriptor
    • Object.defineProperty

    For by far the most browsers, these features will already be natively available. Generally, I would highly recommend using something like Polyfill.app which takes care of this stuff automatically.

    Contributing

    Do you want to contribute? Awesome! Please follow these recommendations.

    Maintainers

    Frederik Wessberg
    Frederik Wessberg
    Twitter: @FredWessberg
    Lead Developer

    Backers

    Patreon

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    Backers on Patreon

    FAQ

    Are there any known quirks?

    License

    MIT © Frederik Wessberg (@FredWessberg) (Website)

    Install

    npm i scroll-behavior-polyfill

    DownloadsWeekly Downloads

    29,506

    Version

    2.0.13

    License

    MIT

    Unpacked Size

    155 kB

    Total Files

    8

    Last publish

    Collaborators

    • wessberg