Once the scrollbar reaches the bottom of the available content area there is a slight bouncing effect to comminicate the end of the content. Files 15 through 42 are then revealed from the bottom of the Finder window's viewport, continuing the grid. This time there is a slow downward scrolling action and a scrollbar reactively appears. The same list of files in a Finder window as the previous image. However, without an affordance to indicate the presence of additional offscreen content, the chances are low that someone will bother to check. There’s no visual indication that there’s more content present in this window-the only way to discover it is to scroll downwards. A history lessonĪpple learned the lesson about visible scrollbars the hard way when it introduced its ultra-minimal, disappearing scrollbar indicators: If they don’t know it is there, they won’t take action on it. If someone can’t see something, they won’t know it is there. Will your custom scrollbar colors pass color contrast? Better to prioritize sending styling information for your website or web app’s actual surface area. Network throttling, metered data plans, dead zones, and many other factors beyond your control are all forces you need to contend with. Through the ruthless lens of performance optimization, this is unnecessary data to force someone to download. You might be scoffing at the kilobytes this removal represents, but when it comes to web performance, every little bit counts. Do you need to make someone download that extra data? You probably need to find a new brand strategy if your entire outreach efforts depend on a scrollbar’s appearance. Just because you can, however, does not mean you should.Īsk any successful marketing agency-branding is so much more than how something looks. The controlįor reference, this CodePen is what I used to perform my testing:Ĭustom CSS scrollbar by Eric Bailey CodePen.Ĭan your branding succeed without scrollbars being customized?Ĭustom scrollbars, like custom mouse cursors, can styled to help reinforce the branding of a website or web app. Questions to ask yourself before customizing your scrollbarsįollowing are a list of questions you should ask yourself if you’re considering modifying your scrollbar’s visuals. However, I think there are some accessibility considerations that were not taken into account before this capability was given to us by the platform. Some may argue with this and claim that being allowed to style them with CSS means that it is fair game. Scrollbars are part of the area of the browser that is outside your scope of concern. However, the metaphors drawn from these physical equivalents still persist. We may be long-separated from car dashboards using physical press knobs, swapped out in favor of dangerous, inefficient touchscreens. This phenomenon is why checkboxes use squares and radio buttons use circles-even with flat design removing depth and texture from everything. The more you deviate, the more confusing things get. When you deviate from these standards, you introduce ambiguity.Īmbiguity means less certainty about what the piece of UI is, how you interact with it, and what effects taking action on it will cause. This is important to note.īrowser UI is used to help create consistency across the entire experience of using a device. The browser’s UI is informed by the operating system it is installed on. The scope of concern for the browser is this: From ten thousand feet up, your scope of concern is this: When you style things on the web, you get control over almost the entire experience. Much like custom CSS mouse cursors, I feel this is also a mistake. Apple has a description in the Safari CSS Reference.In the spirit of “ everything old is new again,” browsers are once again supporting the ability to style the scrollbar. webkit-overflow-scrolling: auto /* Stops scrolling immediately */ webkit-overflow-scrolling: touch /* Lets it scroll lazy */ Formal definition Initial valueįormal syntax auto | touch Examples HTML The speed and duration of the continued scrolling is proportional to how vigorous the scroll gesture was. touch Use momentum-based scrolling, where the content continues to scroll for a while after finishing the scroll gesture and removing your finger from the touchscreen. Syntax Values auto Use "regular" scrolling, where the content immediately ceases to scroll when you remove your finger from the touchscreen. The -webkit-overflow-scrolling CSS property controls whether or not touch devices use momentum-based scrolling for a given element. There may also be large incompatibilities between implementations and the behavior may change in the future. Do not use it on production sites facing the Web: it will not work for every user. This feature is non-standard and is not on a standards track.
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