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  2. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  3. Yup Technologies - Wikipedia

    en.wikipedia.org/wiki/Yup_Technologies

    Yup (formerly known as MathCrunch) was founded in 2014 in San Francisco by entrepreneur and angel investor Naguib S. Sawiris. [2] [3] The initial idea for the creation of Yup came as Sawiris observed that students were texting friends and family to help them solve homework problems they could not; Sawiris saw an opportunity for both a business and to have a positive social impact in the ...

  4. React (software) - Wikipedia

    en.wikipedia.org/wiki/React_(software)

    React itself does not come with built-in support for routing. React is primarily a library for building user interfaces, and it does not include a full-fledged routing solution out of the box. Third-party libraries can be used to handle routing in React applications. [30]

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