Abstauben24.de SEO Report Last updated on May 02, 2014 WebRankPage

The DocType of your webpage does not have any influence on your Search ranking. However, make sure the designer adds the tag on all page as the DocType is responsible for similar representation of your webpage on all browser. It just applies standard rules to your website, which will be followed by all browsers.

Specifying language/character encoding can prevent problems with the rendering of special characters.

Search Engines detect the language in which your website has been written, which increases its regional importance as well helps it understand the text. Therefore, it is a must to incorporate language tag and you must make sure you that Google detects your webpage language the same as specified by you. Furthermore, when users translate your webpage to any other language, a source language makes it easy for web translators.

Favicon doesn't impact your Search Relevance or score but it's an icon representing your website which is visible at tabs of browser as well as in bookmarks.

Related keywords should be used in URL of the page, and instead of underscore hyphens should be used to separate them. Furthermore, long URL's should be avoided, keep a limit of upto 7 words in the URL, and remember that URL's are case sensitive.

Text/HTML ratio is an important metric in understanding Search Engine Optimization. It should always be above 15%, so that crawlers are able to gather more data about your website.
You can always improve Text/HTML ratio by adding more content to your website. Recommended range is 25 to 70 percent. More than this percent is likely to be consider as spam.

It is very important that all images should have an alt attribute because search engines cannot manipulate images into text, therefore this attribute helps search engines to understand what the image contains. You can specific image alt attribute as:
<img src="your_image.png" alt="Your images"/>

CSS is cached by the browser, inline CSS causes redundant code to be loaded everytime. This will increase your webpage size as well as load time. Furthermore, it helps the developer by not having to dig through code to find CSS specification.

Search engines cannot look into iframes and as result cannot index the data inside. IFrames are not recommended as these cannot be indexed by crawlers, use "noframes" tag to identify that you are not using them.

Try not to use flash on your website, it is difficult for search engines to index website which are fully based on flash. Try to avoid full flash website to maximize your Search relevance and optimize your website.

Spammers use bots to scan websites for email address. Leaving email address in plain text will increse the no. of spam mails to your users and to other in general as well.

The total number of pages indexed is directly related to the search relevance and visibility of your website, the greater the number of pages indexed the higher your chances of appearing in search results. You can get your site indexed by submitting your sitemap URL though webmaster tools of Search Engines.

Security in today's day and age is a primary concern for most users. Therefore, displaying your security status as safe from Norton SafeWeb, McAfee Site advisor and the likes you'll be able to get more customers and also increase your trust level.

Your site should not be listed in this directory, if it is try to check the reason. Your site's mail server might have been hacked or someone might be using your name to spam others.

Server Signature can provide information about Apache version and other critical software running on your server. Suppose you've not updated to the latest versions with security fixes, your website stands exposed to hackers who can exploit vulnerabilities in software running on you server.