warnings by validation for http://validator.w3.org from Serguei Zouikov on 2018-02-20 (www-validator@w3.org from February 2018)
![PPT - <html xmlns="w3/1999/xhtml" xml:lang="ru-RU" lang="ru-RU"> PowerPoint Presentation - ID:4098478](https://image2.slideserve.com/4098478/slide1-l.jpg "PPT - <html xmlns="w3/1999/xhtml" xml:lang="ru-RU" lang="ru-RU"> PowerPoint Presentation - ID:4098478")
PPT - <html xmlns="w3/1999/xhtml" xml:lang="ru-RU" lang="ru-RU"> PowerPoint Presentation - ID:4098478
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