HTML の文法チェック (lint)
参考:
HTML5のバリデーションを行ってくれるサービス、ソフトウェアまとめ | hifive開発者ブログ
htmllint
参考:
htmllint/htmllint: Unofficial html5 linter and validator – GitHub
htmllint/htmllint-cli: A command line interface for htmllint – GitHub
HTML Tidy
参考:
htacg/tidy-html5: The granddaddy of HTML tools, with support for modern standards – GitHub
Wanted: Command line HTML5 beautifier – Stack Overflow
Are there any command line validation tools for HTML and CSS? – Stack Overflow