It is recommended to alter pages with a code density above 70%.

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This is why we recommend minimizing the amount of code to a maximum of 70%.

CSS and Java Scripts should be used in external files.

If a page has more than 10 images, this may mean they are being used incorrectly. An exception can be made for images such as measurement pixels.

Measurement pixels for statistics can also be seen as an external image.

Remove all inline style declarations by applying CSS.

To optimize for search engines and to ensure short loading times, it is recommended that you restrict the number of images on the pages of your site.

The helps search engines to crawl your website better. is a special file which tells search engines which pages of a website have to be indexed.

The sitemap is an XML file which consists of a list of URLs of the website and a number of extra data such as a page's importance and how often the page changes.

But because measurement pixels contain no information, this is not a problem.

The title is the main text that describes the content of a page.

Lipperhey analyzed the HTML code to see how the page was built up.