![]() We’ll learn more about these properties later in this guide, but for now, let’s look at how the primary CSS overflow values work and how they’re used. Overflow-x, overflow-y, overflow-clip-margin, and overflow-wrap are other properties that can fix overflow problems in CSS, but in slightly different ways. These values are used to either hide or clip overflowing content using specific approaches. The overflow property has a set of unique values it uses to fix overflow problems in CSS. What are the CSS overflow property values? To follow along with the examples and understand the terminologies used in the article, you’ll need to have a fundamental knowledge of CSS. What is the overflow-clip-margin property?.What are the overflow-x and overflow-y properties?.What are the CSS overflow property values?.Rather than providing a general overview of CSS overflow, this guide will inspect each of the CSS overflow values and demonstrate how they can solve overflow problems that are often encountered when building website layouts. The CSS overflow property can be used to fix a broken layout caused by overflow issues that often occur when the content of a given element does not fit within the constraints of its parent element. When a parent element’s width and height are specified with fixed values using pixels or any other fixed CSS values, an overflow is likely to occur when the content within the element increases.įor example, in the below code, as long as the container does not have a specified fixed width or height, the browser will fit the content within the container: //HTML ![]() Overflow occurs when the content within a web element doesn’t fit the constraints of its block formatting context and ends up spilling out:Ī parent element will expand to fit the content within it by default, unless fixed values are specified for its width and height. A new guide to CSS overflowĪs a frontend developer, overflow is one of the most infuriating issues you are likely to encounter when building a website layout. See from I’ll try to write a follow-up post when I understand everything.David Omotayo Follow Frontend developer and indie game enthusiast. ![]() If you happen to know why, send a self-addressed stamped envelope to twitter dot com slash miketaylr and let me know. Unfortunately at least one site relies on this bug (see this comment). So it seems like non-Edge and non-Firefox browsers treat a position: fixed element as a position: absolute element (or something?), when contained by a position: relative parent that also has a z-index set. The only browser this seems to make a difference in is Chrome on Android, which now clips the child element. Mobile + Desktop Opera (Blink): same as ChromeĪnd now, a 3rd testcase which adds user-scalable=no to the meta (viewport) element (the same effect happens if you constrain intial-scale and maximum-scale to 1. Mobile + Desktop Opera (Presto): same as Safariĭesktop Chrome: if the viewport is smaller than the containing parent, then overflow: hidden on the parent kicks in (resize the browser window to see it). Mobile + Desktop Safari: fixpos element is clipped by parent (meaning overflow: hidden worked). Same as first testcase (what I would expect): Now if you throw in both a z-index: 1 (any number will do) and a position: relative on the parent element, things get…different. overflow: hidden on the parent is ignored. But how do browsers behave? Open this testcase and have a look:Įverything behaves as the spec describes. So, according that spec text, the parent element’s overflow shouldn’t have any effect because the fixpos’ parent element is the viewport. The only difference is that for a fixed positioned box, the containing block is established by the viewport. If you have an element with position: fixed inside of an element that has overflow: hidden, what’s the expected rendering when you need to, uh, overflow? Should the inner fixpos element be clipped by its parent or not?įixed positioning is similar to absolute positioning. ![]()
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