html - Enclosing div is higher than containing button -

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i'm trying simple notification overlay. can see code here: http://jsfiddle.net/0uaqsz57/

relevant code this:

<div class="close">     <button class="btn action-link">close</button> </div>

and

 .close {         text-align: right;         button {             line-height: 1em;             height: 1em;         }   }

notice button on right side (nevermind bad styling..). has height of 13px, according chrome dev-tools. enclosing div (.close), has height of 18px, no (css-)padding.

in firefox, button has height of 13.33 px , div height of 21px

in internet explorer height of button 5.33px , enclosing div height of 18.4px

so question is: 1. why this? standard allow behaviour , if so, why? couldn't find specific information on this. 2. how avoid this.

setting 

height : 100%;

would robust option, live demo shows.

this because button can happily scale depending on screen size.

 .close {             text-align: right;             button {                 line-height: 1em;                 height: 100%;             }         }

it means 'button' fill parent container (in case that's close div).


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