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var button = document.getElementById("copy-button"),
    contentHolder = document.getElementById("content-holder");

button.addEventListener("click", function() {

    // We will need a range object and a selection.var range = document.createRange(),
	selection = window.getSelection();

    // Clear selection from any previous data.
    selection.removeAllRanges();

    // Make the range select the entire content of the contentHolder paragraph.
    range.selectNodeContents(contentHolder);

    // Add that range to the selection.
    selection.addRange(range);

    // Copy the selection to clipboard.document.execCommand('copy');// Clear selection if you want to.
    selection.removeAllRanges();

}, false);


/*
 * Modify Copied Text
 */
document.addEventListener('copy', function(e) {

    // We need to prevent the default copy functionality,// otherwise it would just copy the selection as usual.
    e.preventDefault();

    // The copy event doesn't give us access to the clipboard data,// so we need to get the user selection via the Selection API.var selection = window.getSelection().toString();// Transform the selection in any way we want.// In this example we will escape HTML code.var escaped = escapeHTML(selection);// Place the transformed text in the clipboard. 
    e.clipboardData.setData('text/plain', escaped);

});