My Web-related notes      - Browser allowance for cross-origin inclusion of style sheet.      : see https://en.wikipedia.org/wiki/Cross-origin_resource_sharing : ‘A web page may freely embed cross-origin images, stylesheets, scripts, iframes, and videos.’      - A style sheet is considered an *embedded resource*.      : re `embedded resource` see @ non-fractal https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy      - Hypertext Transfer Protocol (HTTP) status codes.      : see https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html      - 2-- Successful response. 3-- Redirection, except 304 means "not modified" 4-- Request error, caused by client 5-- Service error, caused by server      ━━━━━━━━━━━━━━━━━━━━━━━━━━ Markdown compatible HTML ──────────────────────────      - The markdown form of project files `README.html`.      - There the HTML is Markdown compatible only for sake of the Git Hub adaptor link (`README.md`) which is a sibling and effective alias of each `README.html`.      / For an example of these files      : see https://github.com/Michael-Allan/Java_Mode_Tamed      a local Markdown compiler, previewing with      Emacs >+ M-x gfm-mode      / Emacs major mode for Git Hub Markdown.      : see http://jblevins.org/projects/markdown-mode/      Emacs >+ C-c C-c p      - It opens the preview in a new Chrome (or Firefox) tab.      / Not sure why browser sometimes varies, maybe whichever was last built.      Git Hub’s Markdown compiler, previewing with      + Open direct editor.      + Paste content.      / Copying from Emacs.      + Commit.      + View.      + Overwrite with a routine mirror push.      : privately see /usr/local/bin/sync-web