diff --git a/books/free-programming-books-de.md b/books/free-programming-books-de.md
index 7b2c5b788..1851e44ff 100644
--- a/books/free-programming-books-de.md
+++ b/books/free-programming-books-de.md
@@ -120,6 +120,7 @@
 ### HTML and CSS
 
 * [CSS](http://www.peterkropff.de/site/css/css.htm) - Peter Kropff (Grundlagen, OOP, MySQLi, PDO) (Online, PDF)
+* [Das kleine Buch der HTML-/CSS-Frameworks](https://github.com/frontenddogma/html-css-frameworks) – Jens Oliver Meiert
 * [HTML](http://www.peterkropff.de/site/html/html.htm) - Peter Kropff (Online, PDF)
 * [HTML5-Handbuch](http://webkompetenz.wikidot.com/docs:html-handbuch) (Online)
 * [Self HTML](https://wiki.selfhtml.org/wiki/Startseite) (Online)
diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 5b68c2298..8aa21e936 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -941,6 +941,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Code Guide: Standards for developing flexible, durable, and sustainable HTML and CSS](http://mdo.github.io/code-guide/) - Mark Otto
 * [CSS Animation 101](https://github.com/cssanimation/css-animation-101)
 * [CSS Notes for Professionals](http://goalkicker.com/CSSBook) - Compiled from StackOverflow Documentation (PDF)
+* [CSS Optimization Basics](https://github.com/frontenddogma/css-optimization-basics) – Jens Oliver Meiert
 * [CSS Transition vs CSS animation](https://www.freecodecamp.org/news/css-transition-vs-css-animation-handbook/) - Oluwatobi Sofela
 * [Dive Into HTML5](http://diveinto.html5doctor.com) - Mark Pilgrim ([PDF](http://mislav.net/2011/10/dive-into-html5/))
 * [DOM Enlightenment](http://domenlightenment.com) - Cody Lindley (HTML)
@@ -971,12 +972,14 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Practical Series: A website template](https://practicalseries.com/1001-webdevelopment/) - Michael Gledhill (HTML)
 * [Pro HTML5 Programming](https://web.archive.org/web/20181215200026/http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html) - Jen Simmons, Chris O'Connor, Dylan Wooters, Peter Lubbers *(:card_file_box: archived)*
 * [Resilient Web Design](https://resilientwebdesign.com/#Resilientweb%20design) - Jeremy Keith
+* [Rote Learning HTML & CSS](https://meiert.com/en/blog/rote-learning-html-and-css/) – Jens Oliver Meiert
 * [RTL Styling 101](https://rtlstyling.com) - Ahmad Shadeed
 * [Scalable and Modular Architecture for CSS](https://web.archive.org/web/20191116073929/http://smacss.com/) - Jonathan Snook *(:card_file_box: archived)*
 * [The CSS Flexbox Handbook](https://www.freecodecamp.org/news/the-css-flexbox-handbook/) - Benjamin Semah
 * [The CSS Handbook](https://flaviocopes.com/page/css-handbook/) - Flavio Copes (PDF, EPUB, Kindle) *(email address requested)*
 * [The HTML Handbook](https://flaviocopes.com/page/html-handbook/) - Flavio Copes (PDF, EPUB, Kindle) *(email address requested)*
 * [Understanding Flexbox: Everything you need to know](https://ohansemmanuel.github.io/uf_download.html) - Ohans Emmanuel
+* [Upgrade Your HTML](https://github.com/frontenddogma/upgrade-your-html) – Jens Oliver Meiert
 * [W3.CSS Succinctly](https://www.syncfusion.com/ebooks/w3_css_succinctly) - Joseph D. Booth
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus
 * [Web Visual Effects with CSS3](https://leanpub.com/web-visual-effects-with-css3/read) - Thomas Mak
diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 934107461..df9e66d1f 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -656,6 +656,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Signal Computing: Digital Signals in the Software Domain](http://faculty.washington.edu/stiber/pubs/Signal-Computing/Signal%20Computing.pdf) - Michael Stiber, Bilin Zhang Stiber, Eric C. Larson (PDF)
 * [Small Memory Software](https://smallmemory.charlesweir.com/book.html) - Charles Weir, James Noble (HTML)
 * [Software Technical Writing: A Guidebook](https://jamesg.blog/book.pdf) - James Gallagher (PDF)
+* [The Web Development Glossary](https://github.com/frontenddogma/web-development-glossary) – Jens Oliver Meiert
 * [Web Almanac](https://almanac.httparchive.org/static/pdfs/web_almanac_2019_en.pdf) (PDF)
 * [Writing Native Mobile Apps in a Functional Language Succinctly](https://www.syncfusion.com/ebooks/writing_native_mobile_apps_in_a_functional_language_succinctly) - Vassili Kaplan