These are the tags of HTML4 as defined by accepted standards from the W3 Consortium and in use by the common user agents on the web today. They are designed with the idea to communicate meaning in mind, rather than appearance. A (deprecated) tag has already been identified as a candidate for future cleanups of the standard. In the end, there can be only one.
!: a comment or doctype declarationa: an anchorabbr: an abbreviationacronym: an acronymaddress: an address elementapplet: an applet (deprecated)area: an area inside an image mapb: bold textbase: a base URL for all the links in a pagebasefont: a base font (deprecated)bdo: the direction of text displaybig: big textblockquote: a long quotationbody: the body elementbr: a single line breakbutton: a push buttoncaption: a table captioncenter: centered text (deprecated)cite: a citationcode: computer code textcol: attributes for table columnscolgroup: groups of table columnsdd: a definition descriptiondel: deleted textdir: a directory list (deprecated)dfn: a definition termdiv: a section in a documentdl: a definition listdt: a definition termem: emphasized textfieldset: a fieldsetfont: the text size, color and font (deprecated)form: a formframe: a sub window (a frame)frameset: a set of framesh1: header of greatest importanceh2: header of greater importanceh3: header of great importanceh4: header of some importanceh5: header of little importanceh6: header of least importancehead: information about the documenthr: a horizontal rulehtml: an html documenti: italic textiframe: an inline frameimg: an imageinput: an input fieldins: inserted textisindex: a text input element (deprecated)kbd: keyboard textlabel: a label for a form controllegend: a title in a fieldsetli: a list itemlink: a resource referencemap: an image mapmenu: a menu list (deprecated)meta: meta informationnoframes: a noframe sectionnoscript: a noscript sectionobject: an embedded objectol: an ordered listoptgroup: an option groupoption: an option in a drop-down listp: a paragraphparam: a parameter for an objectpre: preformatted textq: a short quotations: strikethrough text (deprecated)samp: sample computer codescript: a scriptselect: a selectable listsmall: small textspan: a section in a documentstrike: strikethrough text (deprecated)strong: strong textstyle: a style definitionsub: subscripted textsup: superscripted texttable: a tabletbody: a table bodytd: a table celltextarea: a text areatfoot: a table footerth: a table headerthead: a table headertitle: the document titletr: a table rowtt: teletype textu: underlined text (deprecated)ul: an unordered listvar: a variable