Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
    Note: Support for Window.find() might change in future versions of Gecko. See Webkit bug 672395. 
   The Window.find() method finds a string in a window sequentially.
 
Syntax
find(aString, aCaseSensitive, aBackwards, aWrapAround, aWholeWord, aSearchInFrames, aShowDialog)
  
Parameters
 aString  -  
The text string for which to search.
   aCaseSensitive  -  
A boolean value. If true, specifies a case-sensitive search.
   aBackwards  -  
A boolean value. If true, specifies a backward search.
   aWrapAround  -  
A boolean value. If true, specifies a wrap around search.
   - 
aWholeWord Unimplemented
  -  
A boolean value. If true, specifies a whole word search. This is not implemented; see Firefox bug 481513.
   aSearchInFrames  -  
A boolean value. If true, specifies a search in frames.
   
 
Return value
true if the string is found; otherwise, false.
 
Examples
JavaScript
function findString(text) {
  document.querySelector("#output").textContent = `String found? ${window.find(
    text,
  )}`;
}
  
HTML
<p>Apples, Bananas, and Oranges.</p>
<button type="button" onClick='findString("Apples")'>Search for Apples</button>
<button type="button" onClick='findString("Bananas")'>
  Search for Bananas
</button>
<button type="button" onClick='findString("Orange")'>Search for Orange</button>
<p id="output"></p>
  
Result
Notes
 In some browsers, Window.find() selects (highlights) the found content on the site. 
 
Specifications
This is not part of any specification.
 
Browser compatibility
 | 
Desktop | 
Mobile | 
 | 
Chrome | 
Edge | 
Firefox | 
Internet Explorer | 
Opera | 
Safari | 
WebView Android | 
Chrome Android | 
Firefox for Android | 
Opera Android | 
Safari on IOS | 
Samsung Internet | 
find | 
1 | 
79 | 
1 | 
No | 
15 | 
3 | 
4.4 | 
18 | 
4 | 
14 | 
1 | 
1.0 |