You’ve probably seen by now applications and websites that use content placeholders before the actual content loads. These are simple mockups of the content that’s going to be displayed. Implementing this technique lets a user know what to expect, it makes your page appear more ‘reliable’ because it removes sizing glitches that happen when the content doesn’t load instantly, and, also, it replaces the boring loading screens. Some people refer to this as “Skeleton CSS.”

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