The read-only sheet property of the ProcessingInstruction interface contains the stylesheet associated to the ProcessingInstruction. 
The xml-stylesheet processing instruction is used to associate a stylesheet in an XML file.
 The read-only sheet property of the ProcessingInstruction interface contains the stylesheet associated to the ProcessingInstruction. 
The xml-stylesheet processing instruction is used to associate a stylesheet in an XML file.
The associated Stylesheet object, or null if there are none.
xml
<?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/css" href="rule.css"?> …
The sheet property of the processing instruction will return the StyleSheet object describing rule.css.
| Specification | 
|---|
| CSS Object Model (CSSOM)  # dom-linkstyle-sheet  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
sheet | 
1 | 79 | 1 | No | 15 | 1 | 4.4 | 18 | 4 | 14 | 1 | 1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/ProcessingInstruction/sheet