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HTML extension stresses
comp., MS	расширение HTML (A feature or setting that is an extension to the formal HTML specification. Extensions may not be supported by all Web browsers, but they may be used widely by Web authors. An example of an extension is marquee scrolling text)
el.	расширение стандартного языка описания структуры гипертекста; расширение языка HTML
Gruzovik, IT	расширение HTML