css3 - CSS - Is it possible to assign the same specification of a class to an id -

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i working application auto-generates html pages , need write css files these pages. want reuse several classes (generated jquery-ui theme), i can not change html element.

so, possible assign same specification of class id?

if possible, create mapping between classes , ids.

example:

<html> <head><style> #charlieid {     /* want #charlie identical .alphaclass */     /* assume can not change html (it auto generated application)*/ }  .alphaclass {     font-size: small;      color: lime; }  .betaclass {     font-size: medium;     color: blue; } </style></head> <body>     <p class="alphaclass">alpha</p>     <p class="betaclass">beta</p>     <p id="charlieid" class="charlieclass">charlie</p> <body></html>

i have hundreds (maybe thousand) ids manage in whole application not in 1 single page. so, have total freedom when comes css, therefore can break down in several css files (one file each page) control ids , main css classes.

afaik there no way "inherit" existing class's style in plain css.

if client-side scripting acceptable, can dynamically add classes. jquery example:

$(document).ready(function() {$('#charlieid').addclass('alphaclass');});

note if do have ability change existing css have misinterpreted question. in case don't have explicitly rewrite style, can use comma-separated list:

#charlieid,  .alphaclass {     font-size: small;      color: lime; }

since indeed are able edit css, can higher-level language, example less. in less, do:

.alphaclass {     font-size: small;      color: lime; }  #charlieid {     .alphaclass }

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