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I am familiar with WP. but for WP I can't handle well on paste codes into it.
Do you know which other blog/doc system supports code showing?
Free secure email: https://tls-mail.com/
Code showing? Like highlight.js?
I have Hexo static site generator. Articles are written in Markdown with embedded code snippets.
Hexo supports syntax highlighting during file generation, but it's quite slow on my laptop, so I made a custom theme that executes highlightjs in the browser.
Read the story of yoursunny.com 2017 rebuild including a section on Hexo:
In April, I ordered 4 VPS and counting.