html - Moulding shapes out of empty tags. Code explanation required -

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i have been trying figure out piece of css animation . markup can see 

<b class = "b switch"> </b>

and applied css style is

.switch {   position: absolute;   left: 2px;   top: 2px;   bottom: 2px;   right: 22px;   background-color: #fff;   border-radius: 36px;   z-index: 1; }

though css style specifies nothing block display or width or height, empty <b> tag still manages curve round circle fits div. how work ? appreciate if threw light on usage of empty <i> or <b> tags , mould them different shapes .

this has nothing tag you're using.

if specify position: absolute, width , height of auto (which default), , 4 of top, right, bottom, , left, element stretch fit within bounds.


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