html - Internet Explorer 11 "n" char based width doesn't fit "n" characters -

i'm building app requires char ("ch") width components. in ie11 doesn't seems working.

for example:

<input style="width: 5ch; padding: 0; margin: 0; font-family: monospace" maxlength="5"> 

the width don't fit 5 characters. knows why? couldn't find answer anywhere.

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plnkr example here

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edited: i'm using monospace family fonts unlike question

better use size attribute:

the size attribute gives number of characters that, in visual rendering, user agent allow user see while editing element's value.

input {    padding: 0;    margin: 0;    font-family: monospace;  }

<input size="5" maxlength="5">