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. 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: O uso da propriedade overflow com valor diferente de visible (seu valor padro), criar um novo contexto de formatao de bloco (en-US). The spec describes it as “reserving space for the scrollbar”. A propriedade overflow especifica quando o contedo de um elemento de nvel de bloco deve ser cortado, exibido com barras de rolagem ou se transborda do elemento. 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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