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vendor/phpoffice/math/docs/usage/elements/superscript.md

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+## Usage
+
+To attach a superscript to an expression, use the `PhpOffice\Math\Element\Superscript` class.
+
+### Methods
+#### getBase
+
+The method has no parameter.
+
+#### getSuperscript
+
+The method has no parameter.
+
+#### setBase
+
+The method has one parameter : 
+
+* `PhpOffice\Math\Element\AbstractElement` **$element**
+
+#### setSuperscript
+
+The method has one parameter : 
+
+* `PhpOffice\Math\Element\AbstractElement` **$element**
+
+## Example
+
+### Math
+<math display="block">
+  <msup>
+    <mi>X</mi>
+    <mn>2</mn>
+  </msup>
+</math>
+
+### XML
+``` xml
+<math display="block">
+  <msup>
+    <mi>X</mi>
+    <mn>2</mn>
+  </msup>
+</math>
+```
+
+### PHP
+
+``` php
+<?php
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Math;
+
+$math = new Math();
+
+$superscript = new Element\Superscript();
+$superscript->setBase(new Element\Identifier('X'));
+$superscript->setSuperscript(new Element\Numeric(2));
+
+$math->add($superscript);
+```