![]() We can spell out whether the gutter is present in it’s classic and overlay variations. The user agent defines that and gives us no control over it. Whether a browser uses a classic or overlay scrollbar is totally up to the UA itself. Not the indicator itself, but the container that holds it. And note that the existence of overflow-x means we have horizontal scrolling in addition to vertical scrolling. Besides sitting flush to the right of the browser, we will see scrollbars on HTML elements where content overflows the element and the overflow property (or overflow-x and overflow-y) are set to the scroll value. While we’re at it, a scrollbars can pop up in other places. In other words, unlike classic scrollbars that take up physical real estate on the screen, overlay scrollbars sit on top of the screen content. We call those overlay scrollbars and they are either partially or fully transparent while sitting on top of the page content. Lately, though, scrollbar appearances have trended toward something much more minimal. The indicator sits inside of the gutter and the gutter takes up physical real estate on the screen when it’s displayed. These are referred to as classic scrollbars. Use the overflow-x property to specify whether the content must be hidden, visible or scrolling horizontally when the content overflows the element’s left and right edges. Those have traditionally been a visual container with a sliding indicator. So we’re all on the same page, a scrollbar is that thing typically on the side of the browser (formally referred to as the “user-agent” - or UA - in the spec) that indicates your scroll position relative to the total available space on the webpage. ![]() There is a consistent experience for users whether they have “overlay” scrollbars or not.Content doesn’t reflow depending on if there is a scrollbar or not.The beauty of this is that now we can make sure: These correspond to overflow-x and overflow-y but the mapping depends on the writing mode of the document. The spec describes it as “reserving space for the scrollbar”. The Level 3 Overflow Module also includes flow relative properties for overflow - overflow-block and overflow-inline. The scrollbar-gutter property in CSS provides flexibility to determine how the space the browser uses to display a scrollbar that interacts with the content on the screen.
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