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High contrast background images
Logos
While logos are typically implemented using <img> tags, using background images instead makes it very simple to substitute a different version of the image when a high-contrast theme is used. The following example shows how this can be done.
Icons
Icons, for example on navigational tabs, are often implemented as background images. When they are, it's extremely easy to define a high-contrast version. The following example shows how this can be done.