To allow a scrolling box to accept focus add tabindex="0", a name with the aria-labelledby attribute, and an appropriate role attribute. For example:

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CSS can then be used to indicate that the box has focus, using the outline property to give a visual clue that it will now be scrollable.

In Using CSS to Enforce Accessibility Adrian Roselli demonstrates how CSS can help prevent accessibility regressions. For example, to only turn on scrolling and add the focus indicator if the correct attributes are used. The following rules will only make the box scrollable if it has a tabindex, aria-labelledby, and role attribute.

You may notice that some scrollers have a pull-to-refresh behavior and other special behaviors, especially when developing for mobile and hybrid applications. This scroll behavior happens on the root scroller. There is only ever one root scroller on a page. By default, the documentElement is the page's root scroller, however, by changing which element is the root scroller, the special behaviors can be applied to scrollers other than the documentElement, we call this new scroller the implicit root scroller.

Overflow properties are set on an element to control what happens when its children need more space than it has available. This can be intentional, like in an interactive map like Google Maps, where a user pans around a large image clipped to a specific size. It can also be unintentional like in a chat application where the user types a lengthy message that doesn’t fit in the text bubble.

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Scroll bars take up space within the padding box and can compete for space if inline and not overlaid. The box model module expands more on this potential source of layout shift.

There are two different clipping options in CSS; text-overflow will help with individual lines of text, and the overflow properties will help control overflow in the box model.

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The overflow-y property controls physical overflow along the vertical axis of the device viewport, therefore scrolling up and down.

You can think of the overflow in two parts. The parent element has a firmly constrained space that will not change. You can think of this as a window. The child elements are content that want more space from the parent. You can think of this as what you are looking through the window at. Managing overflow will help guide how the window frames this content.

This section of the Florida Drivers Handbook includes photos of Florida road signs, traffic signals, and pavement markings and explains each of them.

Yield Ahead. This sign warns of a yield sign ahead. Slow down and be prepared to stop at yield sign or adjust speed to traffic.

To create a root scroller, you can use something called scroller promotion by positioning a container as fixed, ensuring it covers the entire viewport and is z-index on top with a scroller. Experience a root scroller vs a nested implicit scroller here.

One Lane Bridge. The bridge is wide enough for only one vehicle at a time. Make sure the bridge is clear of oncoming traffic before you cross.

scroll-behavior allows you to opt into browser-controlled scrolling to elements. This allows you to specify how in-page navigation like .scrollTo() or links are handled.

Traffic Signal Ahead. This sign warns of traffic signals at the intersection ahead. Slow down; poor visibility is likely.

Animal Crossing. The animal pictured on the sign is common in this area: watch for this species crossing the road particularly during twilight and night-time hours.

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Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Use the text-overflow property on any element that contains text node(s), for example a paragraph,

. It specifies how the text appears when it doesn’t fit in the available space of the element. All viewable HTML text on a page is in text nodes. To use text-overflow you need a single unwrapped line of text, so you must also set overflow to hidden and have a white-space value that prevents wrapping.

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Sharp Right Turn. The road will make a sharp turn to the right. Slow your speed, keep to the right, and do not pass other vehicles.

If two keywords are specified, the first applies to overflow-x and the second to overflow-y. Otherwise, both overflow-x and overflow-y use the same value.

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Merging Traffic. You are coming to a point where another traffic lane joins the one you are on. Watch for other traffic and be ready to yield the right-of-way when necessary.

Slippery When Wet. In wet weather, drive slowly. Do not speed up or brake quickly. Make sharp turns at a very slow speed.

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Reduction of Lanes. There will be fewer lanes ahead. Traffic must merge left. Drivers in the left lane should allow others to merge smoothly. Right lane ends.

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When content extends beyond its parent, there are many options for how you can handle it. You can scroll to add additional space, clip the overflowing edges, indicate the cut-off with an ellipsis, and so much more. Overflow is especially important to consider when developing for phone applications and multiple screen sizes.

The overflow-x property controls overflow along the horizontal axis of the device viewport, therefore scrolling left and right.

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Advisory Speed Sign. The highest safe speed you should travel around the curve ahead is 25 miles per hour. Advisory speed signs may be used with any diamond-shaped warning sign.

Many of these overflow behaviors introduce a scrollbar, but there’s a few specific scroll behaviors and properties that can help you control scrolling on your overflow container.

It's important to make sure that the scrollable area can accept focus so that a keyboard user can tab to the box, then use the arrow keys to scroll.

Divided Highway Ends. The divided highway on which you are traveling ends 350 to 500 feet ahead. You will then be on a roadway with two-way traffic. Keep to the right.

If you’ve ever reached the end of a modal overlay, then continued scrolling and had the page behind the overlay move, this is the scroll chaining, or bubbling up to the parent scroll container. The overscroll-behavior property allows you to prevent overflow scrolling leaking into a parent container (called scroll chaining).