Editing Forward compatibility (section)

===HTML===
[[HTML]] is designed to treat all tags in the same way (as inert, unstyled [[inline element]]s) unless their appearance or behavior is overridden; either by the browser's default settings, or by scripts or styles included in the page.<ref>''[http://meyerweb.com/eric/thoughts/2004/09/15/emreallyem-undoing-htmlcss/ Really undoing html.css]'' by Eric A. Meyer.</ref> This makes most new features degrade gracefully in older browsers. One case where this did not work as intended was script and style blocks, whose contents are meant to be interpreted by the browser instead of being part of the page. Such cases were dealt with by enclosing the contents within comment blocks.<ref>''[https://www.w3schools.com/tags/tag_comment.asp HTML <nowiki><!--...--></nowiki> Tag]'' at w3schools.com: 'You can also use the comment tag to "hide" scripts from browsers without support for scripts [...]'.</ref>

As there is no mandatory upgrade of computers or web browsers, many web developers use a [[graceful degradation]] or [[progressive enhancement]] approach, attempting to make newly-created websites that are usable by people who have turned off Javascript or who have old computers or old web browsers or on a slow connection, yet still taking advantage of faster hardware and better JavaScript support in more modern web browsers, when available.<ref>
[https://www.w3.org/wiki/Graceful_degradation_versus_progressive_enhancement "Graceful degradation versus progressive enhancement"].
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