The default value of the box-sizing property is content-box, but when we set it to border-box this will make the element’s padding and border to also be included in its width and height.
The box-sizing property will allow us to define how the width and height of an element are calculated. Using box-sizing is the best way of tackling the issue of an overflow caused by padding. This problem can be solved in the following ways: This is why giving it padding or border when it is already at 100% will cause an overflow. Meaning, when we give an element a width of maybe 10px, the actual width of that element becomes 10px + padding + border. To fix this issue caused by padding, in this tutorial I am going to introduce two(2) ways of tackling this.īy default in CSS, an element's actual width and height is width + padding + border. It’s no surprise since padding creates extra space within an element. When padding is added to an element with a width or a height of 100% it causes that element to overflow. For example in the demo below the horizontal overflow can be scrolled through whilst the text that extends beyond the height of the box is hidden. It’s also possible to manipulate the overflow of content horizontally or vertically with the overflow-x and overflow-y properties. The scrollbars will only show up if there is content that actually breaks out of the element. 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. autoĪuto overflow is very similar to the scroll value, only it solves the problem of getting scrollbars when you don’t need them. Note: In OS X Lion, when scrollbars are set to only show when being used, scroll behaves more like auto, in that only needed scrollbars will show up. IOS’ momentum scrolling can be enabled for this value with -webkit-overflow-scrolling. Of note with this value is that you get BOTH horizontal and vertical scrollbars no matter what, even if the content requires only one or the other. Setting the overflow value of a box to scroll will hide the content from rendering outside the box, but will offer scrollbars to scroll the interior of the box to view the content. So for example a user has their default font size set larger than you would expect, you may be pushing text outside of a box and hiding it completely from their view. However, bear in mind that content that is hidden in this way is utterly inaccessible (short of viewing the source). This is particularly useful in use with dynamic content and the possibility of an overflow causing serious layout problems. This literally hides any content that extends beyond the box.
The opposite of the default visible is hidden. Generally, you shouldn’t be setting static heights on boxes with web text in them anyway, so it shouldn’t come up. The important thing to remember here is that even though the content is visible outside of the box, that content does not affect the flow of the page. So in general, there is no reason to explicitly set this property to visible unless you are overriding it from being set elsewhere. If you don’t set the overflow property at all, the default is visible. Overflow comes into play more commonly when explicit widths and heights are set and it would be undesirable for any content to spill out, or when scrolling is explicitly being avoided. Unless a height is set, text will just push an element taller as well. Remember that text will naturally wrap at the end of an element (unless white-space is changed) so text will rarely be the cause of overflow.
inherit: sets the overflow to the value of its parent element.initial: uses the default value which is visible.auto: if the content proceeds outside its box then that content will be hidden whilst a scroll bar should be visible for users to read the rest of the content.This can be used with overflow-clip-margin to set the clipped area. clip: content is clipped when it proceeds outside its box.scroll: similar to hidden except users will be able to scroll through the hidden content.hidden: overflowing content will be hidden.This is the default value of the property visible: content is not clipped when it proceeds outside its box.
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