How does PageSourceSearch know what routledgelearning.com is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of routledgelearning.com go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from routledgelearning.com?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as routledgelearning.com?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

routledgelearning.com

Built with jquery-ui 1.14.2, pixi.js 8.21.0, core-js-bundle 3.50.0, vviinn-widgets 2.224.3, @eka-care/medassist-widget 0.1.131, @reachfive/identity-ui 2.1.0, jquery-ui-dist 1.13.3, @silvermine/videojs-quality-selector 1.3.1, @dropins/tools 2.1.0, @constructor-io/constructorio-ui-autocomplete 1.30.1, jqueryui 1.11.1, dygraphs 2.2.2 and more. 5 pages and 138 stored files, last crawled 2026-10-04.

rank 10,130,227 34 libraries 0 identifiers 10 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
jquery-ui	1.14.2	2026-10-04
pixi.js	8.21.0	2026-10-04
core-js-bundle	3.50.0	2026-10-04
vviinn-widgets	2.224.3	2026-10-04
@eka-care/medassist-widget	0.1.131	2026-10-04
@reachfive/identity-ui	2.1.0	2026-10-04
jquery-ui-dist	1.13.3	2026-10-04
@silvermine/videojs-quality-selector	1.3.1	2026-10-04
@dropins/tools	2.1.0	2026-10-04
@constructor-io/constructorio-ui-autocomplete	1.30.1	2026-10-04
jqueryui	1.11.1	2026-10-04
dygraphs	2.2.2	2026-10-04
@desivocal/agents-cdn	1.0.21	2026-10-04
progressbar.js	1.1.1	2026-10-04
jsxgraph	1.13.3	2026-10-04
jquery.fancytree	2.38.5	2026-10-04
@epigraph/configurator	2.7.0	2026-10-04
@jupyter-widgets/html-manager	1.0.15	2026-10-04
@nylas/web-elements	2.6.0	2026-10-04
@chatvolt/embeds	4.3.16	2026-10-04
jquery.flipster	1.1.6	2026-10-04
molstar	5.11.0	2026-10-04
@vitest/utils	5.0.2	2026-10-04
@recogito/annotorious	2.7.14	2026-10-04
mammoth-plus	2.0.2	2026-10-04
hyperformula	3.4.0	2026-10-04
@prefecthq/prefab-ui	0.20.2	2026-10-04
@etchteam/recycling-locator	1.78.1	2026-10-04
maptalks	1.12.1	2026-10-04
@joint/core	4.3.3	2026-10-04
@grigorov-it/mazer	2.2.0	2026-10-04
@selesai/code	0.13.32	2026-10-04
ramp-pcar	4.22.1	2026-10-04
@textea/json-viewer	4.0.1	2026-10-04

Tracking, tag and verification IDs

No analytics property, tag manager container, pixel or site-verification token was found in the stored source.

Third-party hosts

Hosts outside routledgelearning.com that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
cdn.vidstack.io	script stylesheet	view source
developer.wordpress.org	connect	view source
github.com	connect	view source
reactjs.org	connect	view source
transcend-cdn.com	script	view source
twitter.com	connect	view source
use.fontawesome.com	stylesheet	view source
www.facebook.com	connect	view source
www.linkedin.com	connect	view source
www.w3.org	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 138) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
https://routledgelearning.com/essentialgrammars/…custom-addon-front.js?ver=1.6.0	js	20.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/ui/sortable.min.js?ver=1.14.2	js library	24.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…ery.ui.touch-punch.js?ver=0.2.2	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/ui/mouse.min.js?ver=1.14.2	js library	3.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/ui/core.min.js?ver=1.14.2	js library	18.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/js/learndash.js?ver=4.21.2.1	js	44 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/assets/js/custom.js?ver=1.0.0	js	1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/block-variation.js?ver=1.0.0	js	146 B	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=1c52acd1aa37e2554536	js	143.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=a0978839debc564a6608	js	819 B	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=f6273476300cc5fad4cd	js	3.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=7f83233b1caefc2146bb	js	42.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=31c6cec5a4ff7aff483d	js	2.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=3fe927cab37bf38d6a23	js	884 B	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=a976ff3a0f00bc2999a3	js	953 B	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=14a216e0932d72c22976	js	26 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=acca2b4857d83ad1790e	js	9.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=63493eebece0964ac71b	js	29.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=4554fce6276d8910a4ae	js	1.8 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=df3615fd5cb379fb7ffe	js	2.9 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=6c0aa59b65d55dfd509b	js	3.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=2ea455bbfcb75ff06fc8	js	3.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=1dfe7db3940c23ea9216	js	5.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=7ad271045c1fe60f5496	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=4822427ad9c627826631	js	12.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=87ebe53e97bba59805a5	js	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=86c2ff0a5868054f11be	js	13.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=fe587bac92b7d0ef760e	js	1.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=f0f188028580e8dc1255	js	5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=4c6f3dd40077f7c17604	js	2.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=c7582a735ddd2edc9731	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=79bd31ed7de4b0a8ebad	js	5.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=1bf28ded04f9f188bdcb	js	3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…?ver=b0929e0bd08daccaa778	js	39.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/react-dom.min.js?ver=18.3.1	js	131.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…t-jsx-runtime.min.js?ver=18.3.1	js library	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/react.min.js?ver=18.3.1	js library	6.8 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/…/wp-polyfill.min.js?ver=3.15.0	js	29.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/w…?ver=1bf28ded04f9f188bdcb	js	3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/w…?ver=38bd0e230eaffa354d2a	js	957 B	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/w…?ver=efaa5193bbad9c60ffd1	js	39.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/w…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/w…/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/assets/js/custom.js?ver=1.0.0	js	1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=1c52acd1aa37e2554536	js	143.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/block-variation.js?ver=1.0.0	js	146 B	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=a0978839debc564a6608	js	819 B	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=7f83233b1caefc2146bb	js	42.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=f6273476300cc5fad4cd	js	3.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=31c6cec5a4ff7aff483d	js	2.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=3fe927cab37bf38d6a23	js	884 B	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=a976ff3a0f00bc2999a3	js	953 B	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=14a216e0932d72c22976	js	26 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=63493eebece0964ac71b	js	29.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=acca2b4857d83ad1790e	js	9.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=4554fce6276d8910a4ae	js	1.8 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=df3615fd5cb379fb7ffe	js	2.9 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=6c0aa59b65d55dfd509b	js	3.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=2ea455bbfcb75ff06fc8	js	3.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=1dfe7db3940c23ea9216	js	5.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=7ad271045c1fe60f5496	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=4822427ad9c627826631	js	12.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=87ebe53e97bba59805a5	js	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=86c2ff0a5868054f11be	js	13.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=fe587bac92b7d0ef760e	js	1.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=f0f188028580e8dc1255	js	5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=4c6f3dd40077f7c17604	js	2.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=c7582a735ddd2edc9731	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=79bd31ed7de4b0a8ebad	js	5.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=1bf28ded04f9f188bdcb	js	3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…?ver=b0929e0bd08daccaa778	js	39.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/react-dom.min.js?ver=18.3.1	js	131.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…t-jsx-runtime.min.js?ver=18.3.1	js library	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/react.min.js?ver=18.3.1	js library	6.8 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/wp-polyfill.min.js?ver=3.15.0	js	29.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/wp…/vidstack-video.js?ver=1.0.0	js	not fetched	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…custom-addon-front.js?ver=1.6.0	js	20.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/js/learndash.js?ver=4.21.2.1	js	44 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/assets/js/custom.js?ver=1.0.0	js	1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/js/qsm-timer.js?ver=11.2.7	js	17.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/qsm-progressbar.js?ver=11.2.7	js	7.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/js/qsm-common.js?ver=11.2.7	js	10.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…m-quiz-navigation.js?ver=11.2.7	js	110 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/ui/sortable.min.js?ver=1.14.2	js library	24.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…ery.ui.touch-punch.js?ver=0.2.2	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/js/backbone.min.js?ver=1.6.1	js	23.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/js/wp-util.min.js?ver=7.1.2	js	1.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/underscore.min.js?ver=1.13.8	js	18.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/progressbar.min.js?ver=11.2.7	js	29.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…ery.ui.slider-rtl.js?ver=11.2.7	js	18.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/micromodal.min.js?ver=11.2.7	js	5.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/ui/slider.min.js?ver=1.14.2	js library	10.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/ui/mouse.min.js?ver=1.14.2	js library	3.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/ui/core.min.js?ver=1.14.2	js library	18.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/ui/tooltip.min.js?ver=1.14.2	js library	6.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/block-variation.js?ver=1.0.0	js	146 B	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=c0e57a630a0b6f6c3bb5	js	143 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=a0978839debc564a6608	js	816 B	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=f6273476300cc5fad4cd	js	3.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=3e5852e42cee1c239bae	js	42.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=31c6cec5a4ff7aff483d	js	2.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=3fe927cab37bf38d6a23	js	881 B	2026-10-04	2026-10-04
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https://routledgelearning.com/learningtoteach/wp…?ver=0e8bde2a499ea6073b42	js	29.4 KB	2026-10-04	2026-10-04
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https://routledgelearning.com/learningtoteach/wp…?ver=6c0aa59b65d55dfd509b	js	3.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=1dfe7db3940c23ea9216	js	5.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=7ad271045c1fe60f5496	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=4a4370b2b349066fd440	js	12.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=87ebe53e97bba59805a5	js	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/react-dom.min.js?ver=18.3.1.1	js	128.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=c95f94cbbc1ac3fde84f	js	12.9 KB	2026-10-04	2026-10-04
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https://routledgelearning.com/learningtoteach/wp…?ver=c7582a735ddd2edc9731	js	1.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=4e10a18cb6f21a043fc0	js	5.6 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…t-jsx-runtime.min.js?ver=18.3.1	js library	1.1 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/react.min.js?ver=18.3.1.1	js library	10.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=1bf28ded04f9f188bdcb	js	3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…?ver=efaa5193bbad9c60ffd1	js	39.2 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/wp…/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/wp-includes/js/jqu…jquery-migrate.min.js?ver=3.4.1	js	13.3 KB	2026-10-04	2026-10-04
https://routledgelearning.com/essentialgrammars/	html	92.4 KB	2026-10-04	2026-10-04
https://routledgelearning.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	js library	85.5 KB	2026-10-04	2026-10-04
https://routledgelearning.com/bpscoretextbooks/	html	69 KB	2026-10-04	2026-10-04
https://routledgelearning.com/academicwriting/	html	91.8 KB	2026-10-04	2026-10-04
https://routledgelearning.com/learningtoteach/	html	131.7 KB	2026-10-04	2026-10-04
https://routledgelearning.com/	html	56.7 KB	2026-10-04	2026-10-04

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-04 first crawl

5 pages, 138 files, 3 MB; 34 libraries, 0 identifiers, 10 third-party hosts
34 libraries added
- @vitest/utils 5.0.2
- jquery.flipster 1.1.6
- @grigorov-it/mazer 2.2.0
- jsxgraph 1.13.3
- @eka-care/medassist-widget 0.1.131
- @etchteam/recycling-locator 1.78.1
- @dropins/tools 2.1.0
- @textea/json-viewer 4.0.1
- @nylas/web-elements 2.6.0
- @chatvolt/embeds 4.3.16
- @reachfive/identity-ui 2.1.0
- pixi.js 8.21.0
- and 22 more
11 third-party hosts added
138 files added

Questions about routledgelearning.com

How does PageSourceSearch know what routledgelearning.com is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of routledgelearning.com go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from routledgelearning.com?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as routledgelearning.com?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.