Outlining

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Outlining with -moz-outline(gecko) or outline(W3C) can be used to add borders to an element without affecting properties like width, height, border-width etc. and are useful for debugging rendering errors. The W3C property outline is not supported by IE.

It's important to note, that outline on links is an accessibility feature. It is strongly recommended that you do NOT set outline: 0 on your links, since users who are phisically or otherwise unable to use a mouse won't be able to navigate from link to link on your page (not just clicking, simple navigation).

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