Translation Only ______________________ How the browser understands what to show in the "View for Reading" mode For some sites, the "View for Reading" button is not available for others. By what rules does the browser decide to show the button or not, and, most importantly, what to show? Are there any rules for this? ______________________________________________ You will find all you need in this Google search : https://www.google.ca/search?client=firefox-b&dcr=0&ei=aP4XWvbzLYKejwObxZj4DA&q=coding+for+reader+view&oq=coding+for+reader&gs_l=psy-ab.1.0.0i22i30k1l6.132884.138075.0.142514.17.14.0.3.3.0.72.902.14.14.0....0...1c.1.64.psy-ab..0.17.914...0j0i131k1j0i67k1j0i131i67k1j0i46i67k1j46i67k1j0i10k1j0i13k1j0i13i5i30k1.0.qOEnPANMw5A Always run your code through W3c.org tools. HTML https://validator.w3.org/ CSS https://jigsaw.w3.org/css-validator/ Unicorn https://validator.w3.org/unicorn/ If your code passes by using the above then any browser will show it the same as a other one (slight spacing issues maybe) and Google loves it when your code is perfect. If do not have a web editor program there is BlueGriffon http://bluegriffon.org/ Please let us know if this solved your issue or if need further assistance.