I am interested in consolidating all my small images into one sprite file. For example:
Let's say I want to include a thin background image that is meant to repeat-x across 100% of the width of an element:
Do I need to store this as a separate entity, or is there a way I can incorporate it into the sprite image? I'm not sure if it's possible to do a background-repeat over a portion of a sprite, but I have seen it done somewhere before.
In the realm of CSS3, there is a feature known as image-rect which can be specifically utilized in the Gecko engine found in Firefox 4 and newer versions. This feature, also identified as -moz-image-rect, enables users to select a particular portion of an image for display. By choosing a section of a sprite as the background image and then repeating it, developers can achieve unique design effects.
Although this functionality is not yet widely adopted or established as standard practice, it presents interesting possibilities.
My approach involves creating three variations of sprites: one for icons that do not require repetition, another for horizontally repeating images, and a third for vertically repeating images. By structuring sprites in this manner, multiple repeatable backgrounds can be incorporated into a single sprite without encountering significant complexities during implementation.
To ensure that your sprite image displays correctly, make sure the element using it spans the full width of the sprite. This prevents other images or blank space from leaking when the background image is repeated.
When repeating small background images (1-2px wide), performance may suffer. It's best to use slightly larger images to improve rendering speed, even if it means the image is a bit wider than necessary.
If your element has a fixed height, you can set its width to 100% of the sprite and adjust the max-height accordingly. Alternatively, for elements with a maximum width smaller than the sprite, create a rectangle matching the element's dimensions within the sprite.
If you're unsure about the element's max height and want a gradient effect transitioning to a solid color at the top, position the repeated image at the bottom of the sprite and adjust the background-position with a negative top value like background-position: 0px -300px. The number 300px represents the distance from the top of the sprite to the top of the background image.
Check out how Google positions repeated backgrounds on their sprites for reference:
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