页面标题：缺失

Pages which have a missing page title element, the content is empty, or has a whitespace. Page titles are read and used by both users and the search engines to understand what a page is about. They are important for SEO as page titles are used in rankings, and vital for user experience, as they are displayed in browsers, search engine results and on social networks.

How to fix: It's essential to write concise, descriptive and unique page titles on every indexable URL to help users, and enable search engines to score and rank the page for relevant search queries.