Stack Exchange timeline link user script

se_timeline_link.user.js

// ==UserScript==
// @name        Stack Exchange timeline link
// @namespace   http://vyznev.net/
// @description Adds a link to the question timeline on Stack Exchange
// @include     *stackexchange.com/questions/*
// @include     *stackoverflow.com/questions/*
// @include     *superuser.com/questions/*
// @include     *serverfault.com/questions/*
// @include     *stackapps.com/questions/*
// @include     *mathoverflow.net/questions/*
// @include     *askubuntu.com/questions/*
// @version     1.3
// @grant       none
// @noframes
// ==/UserScript==

var injector = document.createElement('script');
injector.textContent = 'window.StackExchange && StackExchange.ready( ' + function () {
	$('#question, .answer').each( function () {
		var $this = $(this);
		var id = $this.data( $this.is('#question') ? 'questionid' : 'answerid' );
		if (! id) return;
		var html = '<span class="lsep">|</span><a class="userscript-timeline" href="/posts/' + Number(id) + '/timeline" title="timeline for this post">timeline</a>';
		$this.find('.post-menu').append(html);
	} );
} + ' )';
document.body.appendChild(injector);