Three simple front-end HTML/CSS questions_html/css_WEB-ITnose

When using CSS to set the same style layout and appearance for multiple web pages, in order to facilitate modification of these web pages, it is best to use ( ). http://hovertree.com/shortanswer/bjae/7bd72acca3206862.htm

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in HTML, this is ( ). http://hovertree.com/shortanswer/bjae/7779739365f3ca74.htm

In HTML language, what are the start and end tags of rows in a table ( )? http://hovertree.com/shortanswer/bjae/4ea0bbbc90161021.htm

Recommendations for eye protection when using the computer for a long time: http://hovertree.com/hvtart/bjae/8461b549eb0a172d.htm

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