The permission element should have some limits for the min/max-width/height:

• min-width should be sufficient to fit the element text (depends on user agent implementation)
• max-width should be at most 3x min-width
• min-height should be sufficient to fit the element text (1em)
• max-height should be at most 3x min-height
• padding-left/top only work with width/height: auto and are at most 5em/1em
• padding-right/bottom are copied over from padding-left/top in this case