> copy and paste content and not having layout page is annoying at times
HTML was envisioned as an SGML application/vocabulary, and SGML has those power features, such as type-checked shared fragments/text macros (entities, possibly with parameters), safe third-party content transclusion, markup stream processing and filtering for generating a table of content for page or site navigation, content screening for removal/rejection of undesired script in user content, expansion of custom Wiki syntax such as markdown into HTML, producing "views" for RSS or search result pages in pipelines, etc. etc. See [1] for a basic tutorial.
HTML was envisioned as an SGML application/vocabulary, and SGML has those power features, such as type-checked shared fragments/text macros (entities, possibly with parameters), safe third-party content transclusion, markup stream processing and filtering for generating a table of content for page or site navigation, content screening for removal/rejection of undesired script in user content, expansion of custom Wiki syntax such as markdown into HTML, producing "views" for RSS or search result pages in pipelines, etc. etc. See [1] for a basic tutorial.
[1]: https://sgmljs.net/docs/producing-html-tutorial/producing-ht...