// We have to close these tags to support XHTML (#13200)
	wrapMap = {

// Support: IE 9
		option: [ 1, "<select multiple='multiple'>", "</select>" ],

thead: [ 1, "<table>", "</table>" ],
		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],

_default: [ 0, "", "" ]
	};

// Support: IE 9
wrapMap.optgroup = wrapMap.option;

wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.col = wrapMap.thead;
wrapMap.th = wrapMap.td;

jQuery.fn.extend({
	text: function( value ) {
		return jQuery.access( this, function( value ) {
			return value === undefined ?
				jQuery.text( this ) :
				this.empty().append( ( this[ 0 ] && this[ 0 ].ownerDocument || document ).createTextNode( value ) );
		}, null, value, arguments.length );
	},

wrapAll: function( html ) {
		var wrap;

if ( jQuery.isFunction( html ) ) {
			return this.each(function( i ) {
				jQuery( this ).wrapAll( html.call(this, i) );
			});
		}

if ( this[ 0 ] ) {

// The elements to wrap the target around
			wrap = jQuery( html, this[ 0 ].ownerDocument ).eq( 0 ).clone( true );

if ( this[ 0 ].parentNode ) {
				wrap.insertBefore( this[ 0 ] );
			}

wrap.map(function() {
				var elem = this;

while ( elem.firstElementChild ) {
					elem = elem.firstElementChild;
				}

return elem;
			}).append( this );
		}

return this;
	},

wrapInner: function( html ) {
		if ( jQuery.isFunction( html ) ) {
			return this.each(function( i ) {
				jQuery( this ).wrapInner( html.call(this, i) );
			});
		}

return this.each(function() {
			var self = jQuery( this ),
				contents = self.contents();

if ( contents.length ) {
				contents.wrapAll( html );

} else {
				self.append( html );
			}
		});
	},

wrap: function( html ) {
		var isFunction = jQuery.isFunction( html );

return this.each(function( i ) {
			jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
		});
	},

unwrap: function() {
		return this.parent().each(function() {
			if ( !jQuery.nodeName( this, "body" ) ) {
				jQuery( this ).replaceWith( this.childNodes );
			}
		}).end();
	},

append: function() {
		return this.domManip(arguments, true, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				this.appendChild( elem );
			}
		});
	},

prepend: function() {
		return this.domManip(arguments, true, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				this.insertBefore( elem, this.firstChild );
			}
		});
	},

before: function() {
		return this.domManip(arguments, false, function( elem ) {
			if ( this.parentNode ) {
				this.parentNode.insertBefore( elem, this );
			}
		});
	},

after: function() {
		return this.domManip(arguments, false, function( elem ) {
			if ( this.parentNode ) {
				this.parentNode.insertBefore( elem, this.nextSibling );
			}
		});
	},

// keepData is for internal use only--do not document
	remove: function( selector, keepData ) {
		var elem,
			i = 0,
			l = this.length;

for ( ; i < l; i++ ) {
			elem = this[ i ];

if ( !selector || jQuery.filter( selector, [ elem ] ).length > 0 ) {
				if ( !keepData && elem.nodeType === 1 ) {
					jQuery.cleanData( getAll( elem ) );
				}

if ( elem.parentNode ) {
					if ( keepData && jQuery.contains( elem.ownerDocument, elem ) ) {
						setGlobalEval( getAll( elem, "script" ) );
					}
					elem.parentNode.removeChild( elem );
				}
			}
		}

return this;
	},

empty: function() {
		var elem,
			i = 0,
			l = this.length;

for ( ; i < l; i++ ) {
			elem = this[ i ];

if ( elem.nodeType === 1 ) {

// Prevent memory leaks
				jQuery.cleanData( getAll( elem, false ) );

// Remove any remaining nodes
				elem.textContent = "";
			}
		}

return this;
	},

clone: function( dataAndEvents, deepDataAndEvents ) {
		dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
		deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;

return this.map( function () {
			return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
		});
	},

html: function( value ) {
		return jQuery.access( this, function( value ) {
			var elem = this[ 0 ] || {},
				i = 0,
				l = this.length;

if ( value === undefined && elem.nodeType === 1 ) {
				return elem.innerHTML;
			}

// See if we can take a shortcut and just use innerHTML
			if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
				!wrapMap[ ( rtagName.exec( value ) || [ "", "" ] )[ 1 ].toLowerCase() ] ) {

value = value.replace( rxhtmlTag, "<$1></$2>" );

try {
					for ( ; i < l; i++ ) {
						elem = this[ i ] || {};

// Remove element nodes and prevent memory leaks
						if ( elem.nodeType === 1 ) {
							jQuery.cleanData( getAll( elem, false ) );
							elem.innerHTML = value;
						}
					}

elem = 0;

// If using innerHTML throws an exception, use the fallback method
				} catch( e ) {}
			}

if ( elem ) {
				this.empty().append( value );
			}
		}, null, value, arguments.length );
	},

replaceWith: function( value ) {
		var isFunction = jQuery.isFunction( value );

// Make sure that the elements are removed from the DOM before they are inserted
		// this can help fix replacing a parent with child elements
		if ( !isFunction && typeof value !== "string" ) {
			value = jQuery( value ).not( this ).detach();
		}

return value !== "" ?
			this.domManip( [ value ], true, function( elem ) {
				var next = this.nextSibling,
					parent = this.parentNode;

if ( parent ) {
					jQuery( this ).remove();
					parent.insertBefore( elem, next );
				}
			}) :
			this.remove();
	},

detach: function( selector ) {
		return this.remove( selector, true );
	},

domManip: function( args, table, callback ) {

// Flatten any nested arrays
		args = core_concat.apply( [], args );

var fragment, first, scripts, hasScripts, node, doc,
			i = 0,
			l = this.length,
			set = this,
			iNoClone = l - 1,
			value = args[ 0 ],
			isFunction = jQuery.isFunction( value );

// We can't cloneNode fragments that contain checked, in WebKit
		if ( isFunction || !( l <= 1 || typeof value !== "string" || jQuery.support.checkClone || !rchecked.test( value ) ) ) {
			return this.each(function( index ) {
				var self = set.eq( index );
				if ( isFunction ) {
					args[ 0 ] = value.call( this, index, table ? self.html() : undefined );
				}
				self.domManip( args, table, callback );
			});
		}

if ( l ) {
			fragment = jQuery.buildFragment( args, this[ 0 ].ownerDocument, false, this );
			first = fragment.firstChild;

if ( fragment.childNodes.length === 1 ) {
				fragment = first;
			}

if ( first ) {
				table = table && jQuery.nodeName( first, "tr" );
				scripts = jQuery.map( getAll( fragment, "script" ), disableScript );
				hasScripts = scripts.length;

// Use the original fragment for the last item instead of the first because it can end up
				// being emptied incorrectly in certain situations (#8070).
				for ( ; i < l; i++ ) {
					node = fragment;

if ( i !== iNoClone ) {
						node = jQuery.clone( node, true, true );

// Keep references to cloned scripts for later restoration
						if ( hasScripts ) {
							// Support: QtWebKit
							// jQuery.merge because core_push.apply(_, arraylike) throws
							jQuery.merge( scripts, getAll( node, "script" ) );
						}
					}

callback.call(
						table && jQuery.nodeName( this[ i ], "table" ) ?
							findOrAppend( this[ i ], "tbody" ) :
							this[ i ],
						node,
						i
					);
				}

if ( hasScripts ) {
					doc = scripts[ scripts.length - 1 ].ownerDocument;

// Reenable scripts
					jQuery.map( scripts, restoreScript );

// Evaluate executable scripts on first document insertion
					for ( i = 0; i < hasScripts; i++ ) {
						node = scripts[ i ];
						if ( rscriptType.test( node.type || "" ) &&
							!data_priv.access( node, "globalEval" ) && jQuery.contains( doc, node ) ) {

if ( node.src ) {
								// Hope ajax is available...
								jQuery.ajax({
									url: node.src,
									type: "GET",
									dataType: "script",
									async: false,
									global: false,
									"throws": true
								});
							} else {
								jQuery.globalEval( node.textContent.replace( rcleanScript, "" ) );
							}
						}
					}
				}
			}
		}

return this;
	}
});

jQuery.each({
	appendTo: "append",
	prependTo: "prepend",
	insertBefore: "before",
	insertAfter: "after",
	replaceAll: "replaceWith"
}, function( name, original ) {
	jQuery.fn[ name ] = function( selector ) {
		var elems,
			ret = [],
			insert = jQuery( selector ),
			last = insert.length - 1,
			i = 0;

for ( ; i <= last; i++ ) {
			elems = i === last ? this : this.clone( true );
			jQuery( insert[ i ] )[ original ]( elems );

// Support: QtWebKit
			// .get() because core_push.apply(_, arraylike) throws
			core_push.apply( ret, elems.get() );
		}

return this.pushStack( ret );
	};
});

jQuery.extend({
	clone: function( elem, dataAndEvents, deepDataAndEvents ) {
		var i, l, srcElements, destElements,
			clone = elem.cloneNode( true ),
			inPage = jQuery.contains( elem.ownerDocument, elem );

// Support: IE >=9
		// Fix Cloning issues
		if ( !jQuery.support.noCloneChecked && ( elem.nodeType === 1 || elem.nodeType === 11 ) && !jQuery.isXMLDoc( elem ) ) {

// We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
			destElements = getAll( clone );
			srcElements = getAll( elem );

for ( i = 0, l = srcElements.length; i < l; i++ ) {
				fixInput( srcElements[ i ], destElements[ i ] );
			}
		}

// Copy the events from the original to the clone
		if ( dataAndEvents ) {
			if ( deepDataAndEvents ) {
				srcElements = srcElements || getAll( elem );
				destElements = destElements || getAll( clone );

for ( i = 0, l = srcElements.length; i < l; i++ ) {
					cloneCopyEvent( srcElements[ i ], destElements[ i ] );
				}
			} else {
				cloneCopyEvent( elem, clone );
			}
		}

// Preserve script evaluation history
		destElements = getAll( clone, "script" );
		if ( destElements.length > 0 ) {
			setGlobalEval( destElements, !inPage && getAll( elem, "script" ) );
		}

// Return the cloned set
		return clone;
	},

buildFragment: function( elems, context, scripts, selection ) {
		var elem, tmp, tag, wrap, contains, j,
			i = 0,
			l = elems.length,
			fragment = context.createDocumentFragment(),
			nodes = [];

for ( ; i < l; i++ ) {
			elem = elems[ i ];

if ( elem || elem === 0 ) {

// Add nodes directly
				if ( jQuery.type( elem ) === "object" ) {
					// Support: QtWebKit
					// jQuery.merge because core_push.apply(_, arraylike) throws
					jQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );

// Convert non-html into a text node
				} else if ( !rhtml.test( elem ) ) {
					nodes.push( context.createTextNode( elem ) );

// Convert html into DOM nodes
				} else {
					tmp = tmp || fragment.appendChild( context.createElement("div") );

// Deserialize a standard representation
					tag = ( rtagName.exec( elem ) || ["", ""] )[ 1 ].toLowerCase();
					wrap = wrapMap[ tag ] || wrapMap._default;
					tmp.innerHTML = wrap[ 1 ] + elem.replace( rxhtmlTag, "<$1></$2>" ) + wrap[ 2 ];

// Descend through wrappers to the right content
					j = wrap[ 0 ];
					while ( j-- ) {
						tmp = tmp.firstChild;
					}

// Support: QtWebKit
					// jQuery.merge because core_push.apply(_, arraylike) throws
					jQuery.merge( nodes, tmp.childNodes );

// Remember the top-level container
					tmp = fragment.firstChild;

// Fixes #12346
					// Support: Webkit, IE
					tmp.textContent = "";
				}
			}
		}

// Remove wrapper from fragment
		fragment.textContent = "";

i = 0;
		while ( (elem = nodes[ i++ ]) ) {

// #4087 - If origin and destination elements are the same, and this is
			// that element, do not do anything
			if ( selection && jQuery.inArray( elem, selection ) !== -1 ) {
				continue;
			}

contains = jQuery.contains( elem.ownerDocument, elem );

// Append to fragment
			tmp = getAll( fragment.appendChild( elem ), "script" );

// Preserve script evaluation history
			if ( contains ) {
				setGlobalEval( tmp );
			}

// Capture executables
			if ( scripts ) {
				j = 0;
				while ( (elem = tmp[ j++ ]) ) {
					if ( rscriptType.test( elem.type || "" ) ) {
						scripts.push( elem );
					}
				}
			}
		}

return fragment;
	},

cleanData: function( elems, /* internal */ acceptData ) {
		var data, elem, type,
			l = elems.length,
			i = 0,
			special = jQuery.event.special;

for ( ; i < l; i++ ) {
			elem = elems[ i ];

if ( acceptData || jQuery.acceptData( elem ) ) {

data = data_priv.access( elem );

if ( data ) {
					for ( type in data.events ) {
						if ( special[ type ] ) {
							jQuery.event.remove( elem, type );

// This is a shortcut to avoid jQuery.event.remove's overhead
						} else {
							jQuery.removeEvent( elem, type, data.handle );
						}
					}
				}
			}
			// Discard any remaining `private` and `user` data
			data_discard( elem );
		}
	}
});

function findOrAppend( elem, tag ) {
	return elem.getElementsByTagName( tag )[ 0 ] || elem.appendChild( elem.ownerDocument.createElement(tag) );
}

// Replace/restore the type attribute of script elements for safe DOM manipulation
function disableScript( elem ) {
	var attr = elem.getAttributeNode("type");
	elem.type = ( attr && attr.specified ) + "/" + elem.type;
	return elem;
}
function restoreScript( elem ) {
	var match = rscriptTypeMasked.exec( elem.type );

if ( match ) {
		elem.type = match[ 1 ];
	} else {
		elem.removeAttribute("type");
	}

return elem;
}

// Mark scripts as having already been evaluated
function setGlobalEval( elems, refElements ) {
	var l = elems.length,
		i = 0;

for ( ; i < l; i++ ) {
		data_priv.set(
			elems[ i ], "globalEval", !refElements || data_priv.get( refElements[ i ], "globalEval" )
		);
	}
}

function cloneCopyEvent( src, dest ) {
	var i, l, type, pdataOld, pdataCur, udataOld, udataCur, events;

if ( dest.nodeType !== 1 ) {
		return;
	}

// 1. Copy private data: events, handlers, etc.
	if ( data_priv.hasData( src ) ) {
		pdataOld = data_priv.access( src );
		pdataCur = jQuery.extend( {}, pdataOld );
		events = pdataOld.events;

data_priv.set( dest, pdataCur );

if ( events ) {
			delete pdataCur.handle;
			pdataCur.events = {};

for ( type in events ) {
				for ( i = 0, l = events[ type ].length; i < l; i++ ) {
					jQuery.event.add( dest, type, events[ type ][ i ] );
				}
			}
		}
	}

// 2. Copy user data
	if ( data_user.hasData( src ) ) {
		udataOld = data_user.access( src );
		udataCur = jQuery.extend( {}, udataOld );

data_user.set( dest, udataCur );
	}
}

function getAll( context, tag ) {
	var ret = context.getElementsByTagName ? context.getElementsByTagName( tag || "*" ) :
			context.querySelectorAll ? context.querySelectorAll( tag || "*" ) :
			[];

return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
		jQuery.merge( [ context ], ret ) :
		ret;
}

// Support: IE >= 9
function fixInput( src, dest ) {
	var nodeName = dest.nodeName.toLowerCase();

// Fails to persist the checked state of a cloned checkbox or radio button.
	if ( nodeName === "input" && manipulation_rcheckableType.test( src.type ) ) {
		dest.checked = src.checked;

// Fails to return the selected option to the default selected state when cloning options
	} else if ( nodeName === "input" || nodeName === "textarea" ) {
		dest.defaultValue = src.defaultValue;
	}
}

src/manipulation.js

Maintainability

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