html - Reason for specifying height on inline span element -


i wonder point specify height on span element when inline element. appearance doesn't change no matter value set on height span selector.

here complete markup , css

<!doctype html> <html>     <head>         <meta charset = "utf-8">         <title>relative positioning</title>         <style type = "text/css">            p                        {               font-size: 1.3em;               font-family: verdana, arial, sans-serif;             }            span                    {                color: red;               font-size: .6em;                height: .6em;            }            .super                  {                position: relative;               top: -1ex;             }            .sub                    {                position: relative;               bottom: -1ex;              }             .shiftleft               {                 position: relative;                left: -1ex;              }             .shiftright              {                 position: relative;                right: -1ex;              }         </style>     </head>     <body>        <p>the text @ end of sentence            <span class = "super">is in superscript</span>.        </p>         <p>the text @ end of sentence           <span class = "sub">is in subscript</span>.        </p>         <p>the text @ end of sentence           <span class = "shiftleft">is shifted left</span>.        </p>         <p>the text @ end of sentence           <span class = "shiftright">is shifted right</span>.        </p>     </body> </html>

//tony

as long <span>-element defined inline-element (its default) value height won't have effect.

from w3.org specs 10.5 content height: 'height' property:

this property not apply non-replaced inline elements. see the section on computing heights , margins non-replaced inline elements rules used instead.


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