![]() Sometimes this is what you want - or rather, what you’re forced to live with. They do not pay the overflow any mind, wbich may cause the overflowing content to overlap the content of the next block. Thus, when calculating the position of the next block the browsers place the block exactly where it should be given the height of the previous block and the margins of both. In fact, at that point in the algorithm the browsers have no way of knowing that the content overflows. When calculating the position of other blocks, the browsers' layout algorithm uses the width and height of the box you defined, and disregards the fact that content may be spilling out of the block. Although that keeps the content readable, it also means the content might overlap with the block below or to the right of the affected block, which can be very ugly. Overflow: visible means that you allow the content to spill out of its block. The default value is visible, and that's the one that causes the 'CSS is Awesome' effect. It has four values, visible, hidden, scroll, and auto. ![]() The overflow declaration allows you to define what to do with content that overflows its box. In these cases, the overflow declaration is your friend. No doubt you had good reasons, but since it was your decision, the onus of solving any resulting issues is on you. You could have used min-width or flexbox - both are good in dealing with unexpectedly large content - but you didn't. Sure it could! And it would, except that you specifically instructed the box not to by giving it a fixed width. Why would the 'Awesome' flow out of the box? Why should CSS be so complicated? Couldn't the box simply grow to contain the 'Awesome'? The most famous example of overflow is the "CSS is Awesome" meme that's been around ever since 2009.īorn out of one web developer's frustration with CSS's overflow behavior, this meme took on a life of its own and became an example of what was wrong with CSS. This short chapter discusses how to deal with overflow. If you allow them to grow as tall and wide as they need to be you avoid quite a few problems. The easiest way to avoid overflow is not giving your blocks a fixed height in the first place. In both cases the content of your blocks will become larger than you expected, and if you've given them a fixed width or height that might lead to overflow: content escaping from the block - or at least, attempting to escape. What happens if if the final text is much longer than the fake text you used during production? Or what if there's a wide image you hadn't counted on? For instance, you cannot know in advance how long the texts will be that will be shown in your site. Not knowing how tall something is is fundamental to web design. "Web design is a constant battle against overflow." [ Would you like to improve your CSS? You can hire me as a ![]() Today I present the first draft of the short overflow article. This series of article snippets are a sort of try-out - pre-drafts I’d like to get feedback on in order to figure out if I’m on the right track. I am going to write a “CSS for JavaScripters” book, and therefore I need to figure out how to explain CSS to JavaScripters. overflow: visibleīy default, the overflow is visible, meaning that it is not clipped and it renders outside the element's box.Sitemap contact Book draft: overflow chapter Note: In OS X Lion (on Mac), scrollbars are hidden by default and only shown when being used (even though "overflow:scroll" is set). Note: The overflow property only works for block elements with a specified height. auto - Similar to scroll, but it adds scrollbars only when necessary.scroll - The overflow is clipped, and a scrollbar is added to see the rest of the content.hidden - The overflow is clipped, and the rest of the content will be invisible.The content renders outside the element's box The overflow property has the following values: The overflow property specifies whether to clip the content or to add scrollbars when the content of an element is too big to fit in the specified area. The CSS overflow property controls what happens to content that is too big to fit into an area.
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