Accounting for Internationalization with CSS and HTML
Briefly

Internationalization, also called "i18n," is the process of ensuring that your software or application can be easily used and understood by users around the world.
Physical properties use "left," "right," "top," and "bottom" to determine which side of an element is affected. Logical properties use "inline" and "block," with inline representing left and right and block representing top and bottom.
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