Picto thématique

Rule n° 101 - The registration number issued to companies or organizations under the legal registration procedures in force in their country is indicated.

On the Internet, a company may be totally fictitious. The citation of an official number is an essential indicator of its administrative reality.

#Identification and contact #Editorial


  • Give users a verifiable indication of the official existence of the structure offering the content or services.


Indicate the registration number issued to the company or association at the end of the legal registration procedures in force in its country. This best practice does not apply to individuals, unless they are registered as a legal entity (freelancers, self-employed persons, etc.).


On the home page, the legal notices page, the about page, the contact page, the terms of service or the terms and conditions pages:

  • Check that the registration number issued to the company or association at the end of the legal registration procedures in force in its country is indicated.

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Overview and background

The 240 Opquast rules are defined and agreed upon by an extensive community of web professionals and academics. These web quality assurance guidance rules started as a list of best practices 20 years ago. They have since been revised every five years and have been tried and tested via millions of web interactions by Opquast community’s customers, including the leading CMS communities which have developed plugins for WordPress, Drupal and Prestashop. The most recent version, v4, was established in 2020.

Each rule has individual technical sheets and the rules can be searched by project phase or various topics: e-commerce, data-privacy, internationalization, security, code, etc, or by themes: accessibility, SEO, mobile, privacy, and ecodesign. The complete checklist is available on a creative commons license BY-SA.

To learn more about the Opquast approach, read this article published at Smashing Magazine

Broad application and benefits

The rules should be applied to your projects from the design phase through to post-implementation , and they should be understood by all professionals with web and customer experience (CX) responsibilities: from strategy to operations, marketers to project managers, and editorial to technical staff. The benefits of using this ruleset are numerous, including improving customer satisfaction, web performance, and e-commerce, and expanding your client base, while also decreasing your errors and costs.

Multidisciplinary verticles - accessiiblity, SEO, e-commerce, ecodesign etc..- starting from the foundational Opquast base.

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The objective of these rules and the Opquast community mission is ‘making the web better’ for your customers and for everyone! Opquast rules cover the key major areas of risk that can negatively affect website users such as privacy, ecodesign, accessibility and security.

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