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<!DOCTYPE html> <html lang="en-US"> <body> <p>Select this paragraph and click on the button to Check query command "SelectAll".</p> <button onclick="myFunction()">Click Me</button> <script> function myFunction(){ //Try to replace "SelectAll" to "copy" var flg = document.queryCommandEnabled("SelectAll"); if(flg) alert("You can select all the text in the document"); else alert("query command is disabled"); } </script> </body> </html>
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