GitHub - joshbuchea/HEAD: A simple guide to HTML <head> elements<!-- The following 2 meta tags *must* come first in the <head> to consistently ensure proper document rendering. Any other head element should come *after* these tags. --> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- Allows control over where resources are loaded from. Place as early in the <head> as possible, as the tag only applies to resources
canonical属性とは／link rel=”canonical”によるURL正規化タグ——SEOにとって非常に重要な進歩（前編） | Web担当者Forum
