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== Obsolete/deprecated elements ==
{{main|Wikipedia:HTML5#Obsolete elements and attributes}}
These elements are now obsolete and either deprecated or removed in HTML5, although they are still supported by browsers.<ref name="w3c_obsolete" /> '''Their use should be avoided on Wikipedia.''' These tags either have an alternate tag or a template that replaces their function with CSS; except for {{tag|big}}, the tags are being replaced by editors on pages throughout Wikipedia (see [[Wikipedia:Linter]] for more details). See {{slink|Wikipedia:HTML5#Obsolete elements and attributes}} for more details on obsolete HTML parts and their replacements.
=== big ===
{{dc|{{tag|big}} (obsolete)}} was used to render text in a "large" font.
Templates: {{tlx|big}} uses CSS.
=== center ===
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{{dc|{{tag|rb}} (obsolete)}} was used to mark base text in a ruby annotation.
For replacements, see: [[Help:HTML in wikitext#rp, rt, rtc, ruby]]
=== strike ===
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{{details|mw:Extension:InputBox}}
{{tag|input|o}} is used to create [[Form (HTML)|forms]]. The {{xtag|inputbox}} extension tag is used to create a text box with a button.
== HTML Tidy ==
{{historical |type=section}}
[[HTML Tidy]] is an outdated HTML4 library{{vague|upstream is now HTML5}} that is [[:mw:Parsing/Replacing Tidy|slated for removal]]. Tidy parses the MediaWiki output and cleans it up to increase the likelihood that valid HTML4 is rendered. For example, with Tidy enabled, {{tag|br|o}}, {{tag|br|c}}, {{tag|br/|o}}, {{tag|br.|o}} all rendered as {{tag|br|s}}. Tidy is not enabled for [[Help:MediaWiki namespace|MediaWiki interface pages]]. Tidy was never perfect and has been known to introduce errors.
== Exceptions ==
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