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Code Checker shows the percentage ratio between the text and the HTML source code of a web page that is seen by the search engine bots.
This way you can easily understand if you wrote a greater amount of content of the text of the HTM code of the page.
The HTML text report is very important for SEO, with the release of the update to Google Panda and Penguin, Google has given much more importance to the content of a page.
For better SEO text / code ratio would be between 20-70%.