www.doe.co.jp

Chrome has a built-in plugin for PDFs. It works in desktop mode but when you open on mobile it does not. Even if you simulate mobile using dev tools and enable mobile devices (see below example for ipad) https://github.com/SAP/openui5/issu…

https://html.spec.whatwg.org/multipage/

http://no1026.com/archives/104 https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/Stacking_and_float

https://web-camp.io/magazine/archives/27842

https://k-design.xyz/cording/block-and-inline/

https://app.codegrid.net/entry/z-index-1

https://ferret-plus.com/6033

https://qiita.com/4npei/items/60c495fafc43f166b935