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update accessibility section

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Marco Biedermann 2015-02-25 12:47:49 +01:00
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@ -10,11 +10,8 @@ A helpful checklist / collection of Search Engine Optimization (SEO) tips and te
* [Links](#links)
* [Social Media](#social-media)
* [Sitemap](#sitemap)
* [Errors and access](#errors-and-access)
* [Performance](#performance)
* [Accessibility](#accessibility)
* [Mobile](#mobile)
* [Validation and accessibility](#Validation-and-accessibility)
* [Search](#search)
* [Analytics](#analytics)
* [Tools](#tools)
@ -85,17 +82,19 @@ A helpful checklist / collection of Search Engine Optimization (SEO) tips and te
* **[Video sitemap](https://support.google.com/webmasters/answer/80471):** Make sure, search engines know about all the video content on your site
* **[Mobile sitemap](https://support.google.com/webmasters/answer/6082207):** For feature phones, you can create a mobile sitemap
## Errors and access
* provide 403 - Acced denied page
* provide 404 - Page not found page
* add a `robots.txt` file
* Avoid `FILE_NOT_FOUND` errors
## Performance
* Performance and loading time matters
* only serve concatenated and minified files
* if possible no redirects
* compress images ([ImageOptim](https://imageoptim.com/))
## Accessibility
* **403:** provide a 403 - Access denied page
* **404:** provide a 404 - Page not found page
* **Robots:** block pages which should not be indexed via the `robots.txt` file or `<meta name="robots" content="">`
* **File not found:** avoid `404 FILE_NOT_FOUND` errors
* **Redirects:** Avoid redirects if possible. Use 301 redirect instead of 302
* **Pagination:** implement the `rel="next"` and `rel="prev"` attributes to links
* **Moving a website:** redirect all your links to the new location via `.htaccess`
* **Performance:** performance and loading time is important
* **Validation:** write valid code ([HTML Validator](http://validator.w3.org/) [CSS Validator](http://jigsaw.w3.org/css-validator/))
* **[WAI-Aria](http://www.w3.org/TR/wai-aria/):** use WAI-Aria tags to help machines understanding your code
* **[RichSnippets](http://schema.org/):** markup your code with rich snippets, they show up on the search results page
* **[Custom Search](https://developers.google.com/structured-data/slsb-overview):** with sitelink Google Sitelink search box, people can reach your content more quickly
## Mobile
* **Viewport:** tell browsers how to adjust the page's dimension and scaling to suit the device
@ -104,14 +103,6 @@ A helpful checklist / collection of Search Engine Optimization (SEO) tips and te
* **[AppLinks](http://applinks.org/documentation/):** apps that link to your content can then use this metadata to deep-link into your app
* **[Tap targets](https://developers.google.com/speed/docs/insights/SizeTapTargetsAppropriately):** clickable links should not be too small
## Validation and accessibility
* Write valid markup ([HTML Validator](http://validator.w3.org/) [CSS Validator](http://jigsaw.w3.org/css-validator/))
* use [WAI-Aria](http://www.w3.org/TR/wai-aria/) tags
* use [RichSnippets](http://schema.org/)
## Search
* [Provide a custom search](https://developers.google.com/custom-search/) ([schema.org/SearchAction](http://schema.org/SearchAction), [RichSnippet](https://developers.google.com/webmasters/richsnippets/sitelinkssearch?utm_source=wmc-blog&utm_medium=direct-referral&utm_campaign=sitelinks-searchbox))
## Analytics
* [Google Analytics](http://www.google.com/analytics/)
* [Piwik](http://piwik.org/)