static/tinymce/plugins/paste/editor_plugin_src.js
function grabContent(e) {
				var n, or, rng, oldRng, sel = ed.selection, dom = ed.dom, body = ed.getBody(), posY, textContent;

				// Check if browser supports direct plaintext access
				if (e.clipboardData || dom.doc.dataTransfer) {
					textContent = (e.clipboardData || dom.doc.dataTransfer).getData('Text');

					if (ed.pasteAsPlainText) {
						e.preventDefault();
						process({content : dom.encode(textContent).replace(/\r?\n/g, '<br />')});
						return;
					}
				}

				if (dom.get('_mcePaste'))
					return;

				// Create container to paste into
				n = dom.add(body, 'div', {id : '_mcePaste', 'class' : 'mcePaste', 'data-mce-bogus' : '1'}, '\uFEFF\uFEFF');

				// If contentEditable mode we need to find out the position of the closest element
				if (body != ed.getDoc().body)
					posY = dom.getPos(ed.selection.getStart(), body).y;
				else
					posY = body.scrollTop + dom.getViewPort(ed.getWin()).y;

				// Styles needs to be applied after the element is added to the document since WebKit will otherwise remove all styles
				// If also needs to be in view on IE or the paste would fail
				dom.setStyles(n, {
					position : 'absolute',
					left : tinymce.isGecko ? -40 : 0, // Need to move it out of site on Gecko since it will othewise display a ghost resize rect for the div
					top : posY - 25,
					width : 1,
					height : 1,
					overflow : 'hidden'
				});

				if (tinymce.isIE) {
					// Store away the old range
					oldRng = sel.getRng();

					// Select the container
					rng = dom.doc.body.createTextRange();
					rng.moveToElementText(n);
					rng.execCommand('Paste');

					// Remove container
					dom.remove(n);

					// Check if the contents was changed, if it wasn't then clipboard extraction failed probably due
					// to IE security settings so we pass the junk though better than nothing right
					if (n.innerHTML === '\uFEFF\uFEFF') {
						ed.execCommand('mcePasteWord');
						e.preventDefault();
						return;
					}

					// Restore the old range and clear the contents before pasting
					sel.setRng(oldRng);
					sel.setContent('');

					// For some odd reason we need to detach the the mceInsertContent call from the paste event
					// It's like IE has a reference to the parent element that you paste in and the selection gets messed up
					// when it tries to restore the selection
					setTimeout(function() {
						// Process contents
						process({content : n.innerHTML});
					}, 0);

					// Block the real paste event
					return tinymce.dom.Event.cancel(e);
				} else {
					function block(e) {
						e.preventDefault();
					};

					// Block mousedown and click to prevent selection change
					dom.bind(ed.getDoc(), 'mousedown', block);
					dom.bind(ed.getDoc(), 'keydown', block);

					or = ed.selection.getRng();

					// Move select contents inside DIV
					n = n.firstChild;
					rng = ed.getDoc().createRange();
					rng.setStart(n, 0);
					rng.setEnd(n, 2);
					sel.setRng(rng);

					// Wait a while and grab the pasted contents
					window.setTimeout(function() {
						var h = '', nl;

						// Paste divs duplicated in paste divs seems to happen when you paste plain text so lets first look for that broken behavior in WebKit
						if (!dom.select('div.mcePaste > div.mcePaste').length) {
							nl = dom.select('div.mcePaste');

							// WebKit will split the div into multiple ones so this will loop through then all and join them to get the whole HTML string
							each(nl, function(n) {
								var child = n.firstChild;

								// WebKit inserts a DIV container with lots of odd styles
								if (child && child.nodeName == 'DIV' && child.style.marginTop && child.style.backgroundColor) {
									dom.remove(child, 1);
								}

								// Remove apply style spans
								each(dom.select('span.Apple-style-span', n), function(n) {
									dom.remove(n, 1);
								});

								// Remove bogus br elements
								each(dom.select('br[data-mce-bogus]', n), function(n) {
									dom.remove(n);
								});

								// WebKit will make a copy of the DIV for each line of plain text pasted and insert them into the DIV
								if (n.parentNode.className != 'mcePaste')
									h += n.innerHTML;
							});
						} else {
							// Found WebKit weirdness so force the content into paragraphs this seems to happen when you paste plain text from Nodepad etc
							// So this logic will replace double enter with paragraphs and single enter with br so it kind of looks the same
							h = '<p>' + dom.encode(textContent).replace(/\r?\n\r?\n/g, '</p><p>').replace(/\r?\n/g, '<br />') + '</p>';
						}

						// Remove the nodes
						each(dom.select('div.mcePaste'), function(n) {
							dom.remove(n);
						});

						// Restore the old selection
						if (or)
							sel.setRng(or);

						process({content : h});

						// Unblock events ones we got the contents
						dom.unbind(ed.getDoc(), 'mousedown', block);
						dom.unbind(ed.getDoc(), 'keydown', block);
					}, 0);
				}
			}
function grabContent(e) {
				var n, or, rng, oldRng, sel = ed.selection, dom = ed.dom, body = ed.getBody(), posY, textContent;

				// Check if browser supports direct plaintext access
				if (e.clipboardData || dom.doc.dataTransfer) {
					textContent = (e.clipboardData || dom.doc.dataTransfer).getData('Text');

					if (ed.pasteAsPlainText) {
						e.preventDefault();
						process({content : dom.encode(textContent).replace(/\r?\n/g, '<br />')});
						return;
					}
				}

				if (dom.get('_mcePaste'))
					return;

				// Create container to paste into
				n = dom.add(body, 'div', {id : '_mcePaste', 'class' : 'mcePaste', 'data-mce-bogus' : '1'}, '\uFEFF\uFEFF');

				// If contentEditable mode we need to find out the position of the closest element
				if (body != ed.getDoc().body)
					posY = dom.getPos(ed.selection.getStart(), body).y;
				else
					posY = body.scrollTop + dom.getViewPort(ed.getWin()).y;

				// Styles needs to be applied after the element is added to the document since WebKit will otherwise remove all styles
				// If also needs to be in view on IE or the paste would fail
				dom.setStyles(n, {
					position : 'absolute',
					left : tinymce.isGecko ? -40 : 0, // Need to move it out of site on Gecko since it will othewise display a ghost resize rect for the div
					top : posY - 25,
					width : 1,
					height : 1,
					overflow : 'hidden'
				});

				if (tinymce.isIE) {
					// Store away the old range
					oldRng = sel.getRng();

					// Select the container
					rng = dom.doc.body.createTextRange();
					rng.moveToElementText(n);
					rng.execCommand('Paste');

					// Remove container
					dom.remove(n);

					// Check if the contents was changed, if it wasn't then clipboard extraction failed probably due
					// to IE security settings so we pass the junk though better than nothing right
					if (n.innerHTML === '\uFEFF\uFEFF') {
						ed.execCommand('mcePasteWord');
						e.preventDefault();
						return;
					}

					// Restore the old range and clear the contents before pasting
					sel.setRng(oldRng);
					sel.setContent('');

					// For some odd reason we need to detach the the mceInsertContent call from the paste event
					// It's like IE has a reference to the parent element that you paste in and the selection gets messed up
					// when it tries to restore the selection
					setTimeout(function() {
						// Process contents
						process({content : n.innerHTML});
					}, 0);

					// Block the real paste event
					return tinymce.dom.Event.cancel(e);
				} else {
					function block(e) {
						e.preventDefault();
					};

					// Block mousedown and click to prevent selection change
					dom.bind(ed.getDoc(), 'mousedown', block);
					dom.bind(ed.getDoc(), 'keydown', block);

					or = ed.selection.getRng();

					// Move select contents inside DIV
					n = n.firstChild;
					rng = ed.getDoc().createRange();
					rng.setStart(n, 0);
					rng.setEnd(n, 2);
					sel.setRng(rng);

					// Wait a while and grab the pasted contents
					window.setTimeout(function() {
						var h = '', nl;

						// Paste divs duplicated in paste divs seems to happen when you paste plain text so lets first look for that broken behavior in WebKit
						if (!dom.select('div.mcePaste > div.mcePaste').length) {
							nl = dom.select('div.mcePaste');

							// WebKit will split the div into multiple ones so this will loop through then all and join them to get the whole HTML string
							each(nl, function(n) {
								var child = n.firstChild;

								// WebKit inserts a DIV container with lots of odd styles
								if (child && child.nodeName == 'DIV' && child.style.marginTop && child.style.backgroundColor) {
									dom.remove(child, 1);
								}

								// Remove apply style spans
								each(dom.select('span.Apple-style-span', n), function(n) {
									dom.remove(n, 1);
								});

								// Remove bogus br elements
								each(dom.select('br[data-mce-bogus]', n), function(n) {
									dom.remove(n);
								});

								// WebKit will make a copy of the DIV for each line of plain text pasted and insert them into the DIV
								if (n.parentNode.className != 'mcePaste')
									h += n.innerHTML;
							});
						} else {
							// Found WebKit weirdness so force the content into paragraphs this seems to happen when you paste plain text from Nodepad etc
							// So this logic will replace double enter with paragraphs and single enter with br so it kind of looks the same
							h = '<p>' + dom.encode(textContent).replace(/\r?\n\r?\n/g, '</p><p>').replace(/\r?\n/g, '<br />') + '</p>';
						}

						// Remove the nodes
						each(dom.select('div.mcePaste'), function(n) {
							dom.remove(n);
						});

						// Restore the old selection
						if (or)
							sel.setRng(or);

						process({content : h});

						// Unblock events ones we got the contents
						dom.unbind(ed.getDoc(), 'mousedown', block);
						dom.unbind(ed.getDoc(), 'keydown', block);
					}, 0);
				}
			}
This function grabs the contents from the clipboard by adding a hidden div and placing the caret inside it and after the browser paste is done it grabs that contents and processes that