Is there a rule in CSS that determines the cascading order when multiple classes are defined on an element? (class="one two" vs class="two one")

Right now, there seems to be no such effect.

Example: both divs are orange in color on Firefox

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">

<html>
  <head>
    <style>
      .one { border: 6px dashed green }
      .two { border: 6px dashed orange }
    </style>
  </head>

  <body>

  <div class="one two">
    hello world
  </div>

  <div class="two one">
    hello world
  </div>
web-standards css
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