![]() We can add a snippet to the browser console to show any elements wider than the body. ( Large preview) Using JavaScript to Find Elements Wider Than the Body Whenever you can scroll, there is an overflow in play. If you’re able to scroll, this is a warning that something is wrong with the page. The first way to discover an overflow issue is by scrolling the page horizontally. Let’s explore the ways to detect overflow. There are different ways to detect overflow, from manually scrolling to the left or right or by using JavaScript. If we know when and where it happens, we can home in on that part of a web page. We will explore all of the causes in this article.Īn important part of solving this issue is noticing it in the first place. It could occur because of unexpectedly wide content or a fixed-width element that is wider than the viewport. Overflow with a fixed-width element that is wider than the viewport. An overflow issue occurs when a horizontal scrollbar unintentionally appears on a web page, allowing the user to scroll horizontally. What Is an Overflow Issue?īefore discussing overflow issues, we should ascertain what one is. Some issues can be fixed quickly, and some need a little debugging skill. Because there are many causes of scrollbar problems, there is no straightforward solution. If you’re a front-end developer, you may have come across horizontal scrollbar issues, especially on mobile. We will also explore how modern features in the developer tools (DevTools) can make the process of fixing and debugging easier. The following rules will only make the box scrollable if it has a tabindex, aria-labelledby, and role attribute.In this article, we will explore the causes of overflow issues and how to solve them. For example, to only turn on scrolling and add the focus indicator if the correct attributes are used. In Using CSS to Enforce Accessibility Adrian Roselli demonstrates how CSS can help prevent accessibility regressions. For example: ĬSS 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. To allow a scrolling box to accept focus add tabindex="0", a name with the aria-labelledby attribute, and an appropriate role attribute. 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. 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. Note: Using the overflow property with a value other than visible creates a block formatting context. This respects the user's preferences and shows scrollbars if needed, but hides them by default, and gives responsibility for scrolling to the user and browser. overflow: auto Finally, the value most commonly used, overflow: auto. The difference between clip and hidden is that the clip keyword also forbids all scrolling, including programmatic scrolling. ![]() overflow: clip Like overflow: hidden, the content with overflow: clip is clipped to the element's padding box. ![]() This is a great way to reduce future layout shift if a container may be scrollable in the future based, for example, on resize, and visually prepare the user for scrollable areas. Even if content isn't currently overflowing, scrollbars will be present. ![]() overflow: scroll overflow: scroll enables scrollbars to allow users to scroll through content. overflow: hidden With overflow: hidden content is clipped in the specified direction, and no scrollbars are provided to show it. This ensures that content is never unintentionally hidden and follows the core tenets of "never hide content" or "safe layouts of precise layouts". overflow: visible (default) Without setting the property, overflow: visible is the default value for the web. Let's take a closer look at the values and keywords available for the overflow properties. Otherwise, both overflow-x and overflow-y use the same value. If two keywords are specified, the first applies to overflow-x and the second to overflow-y. The overflow shorthand sets both overflow-x and overflow-y styles in one line: overflow: hidden scroll The overflow-inline and overflow-block properties set the overflow based on the document direction and writing mode.
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