HTML 5 improves interoperability and reduces development costs by developing precise rules on how to handle all HTML elements and how to recover from errors.
In alphabetical order
* 4: indicates whether the element is defined in HTML 4.01.
* 5: indicates whether the element is defined in HTML 5.
| Tag | Description | 4 | 5 |
| <! --... --> | Define comments. | 4 | 5 |
| <! Doctype> | Define the document type. | 4 | 5 |
| <A> | Define a hyperlink. | 4 | 5 |
| <Abbr> | Define the abbreviation. | 4 | 5 |
| <Acronym> | Not supported. Define the abbreviation. | 4 | |
| <Address> | Defines the address element. | 4 | 5 |
| <APPLET> | Not supported. Define the applet. | 4 | |
| <Area> | Defines the region in the image ing. | 4 | 5 |
| <Article> | Define article. | 5 | |
| <Aside> | Defines content other than the page content. | 5 | |
| <Audio> | Define the sound content. | 5 | |
| <B> | Defines the bold text. | 4 | 5 |
| <Base> | Defines the reference URLs of all links on the page. | 4 | 5 |
| <Basefont> | Not supported. Use CSS instead. | 4 | |
| <BDO> | Defines the direction of text display. | 4 | 5 |
| <Big> | Not supported. Define large text. | 4 | |
| <BLOCKQUOTE> | Define a long reference. | 4 | 5 |
| <Body> | Define the body element. | 4 | 5 |
| <Br> | Insert a line break. | 4 | 5 |
| <Button> | Define button. | 4 | 5 |
| <Canvas> | Define a graph. | 5 | |
| <Caption> | Define the table title. | 4 | 5 |
| <Center> | Not supported. Defines the center text. | 4 | |
| <Cite> | Define references. | 4 | 5 |
| <Code> | Define the computer code text. | 4 | 5 |
| <Col> | Defines the attributes of table columns. | 4 | 5 |
| <Colgroup> | Defines the group of table columns. | 4 | 5 |
| <Command> | Define the command button. | 5 | |
| <DataGrid> | Defines the data in the tree-list. | 5 | |
| <Datalist> | Define the drop-down list. | 5 | |
| <Datatemplate> | Define a data template. | 5 | |
| <DD> | Definition description. | 4 | 5 |
| <Del> | Define the delete text. | 4 | 5 |
| <Details> | Defines the details of an element. | 5 | |
| <Dialog> | Define a dialog (session ). | 5 | |
| <Dir> | Not supported. Define the directory list. | 4 | |
| <Div> | Define a part of the document. | 4 | 5 |
| <Dfn> | Define a project. | 4 | 5 |
| <DL> | Definition list. | 4 | 5 |
| <DT> | Define a project. | 4 | 5 |
| <Em> | Define the emphasized text. | 4 | 5 |
| <Embed> | Define external interaction content or plug-ins. | 5 | |
| <Event-source> | Define the target for the event sent by the server. | 5 | |
| <Fieldset> | Define fieldset. | 4 | 5 |
| <Figure> | Defines media content groups and their headers. | 5 | |
| <Font> | No. Defines the font, size, and color of the text. | 4 | |
| <Footer> | Define the footer of a section or page. | 5 | |
| <Form> | Define a form. | 4 | 5 |
| <Frame> | Not supported. Define a child window (frame ). | 4 | |
| <Frameset> | Not supported. Define the framework set. | 4 | |
| <H1> to <H6> | Define Titles 1 to 6. | 4 | 5 |
| <Head> | Define document information. | 4 | 5 |
| <Header> | Define the header of a section or page. | 5 | |
| <HR> | Define a horizontal line. | 4 | 5 |
| <HTML> | Define HTML documents. | 4 | 5 |
| <I> | Defines italic text. | 4 | 5 |
| <IFRAME> | Defines the child window (FRAME) in the row ). | 4 | 5 |
| Define the image. | 4 | 5 | |
| <Input> | Define input fields. | 4 | 5 |
| <Ins> | Define insert text. | 4 | 5 |
| <Isindex> | Not supported. Defines the input fields of a single row. | 4 | |
| <KBD> | Define the keyboard text. | 4 | 5 |
| <Label> | Define the annotation of the Form Control. | 4 | 5 |
| <Legend> | Define the title in fieldset. | 4 | 5 |
| <Li> | Define the items in the list. | 4 | 5 |
| <Link> | Define resource reference. | 4 | 5 |
| <M> | Defines the text with a mark. | 5 | |
| <Map> | Define image ing. | 4 | 5 |
| <Menu> | Define the menu list. | 4 | 5 |
| <Meta> | Define metadata. | 4 | 5 |
| <Meter> | Defines a metric within a predefined range. | 5 | |
| <Nav> | Define the navigation link. | 5 | |
| <Nest> | Defines the nested points in the data template. | 5 | |
| <Noframes> | Not supported. Define the noframe part. | 4 | |
| <NoScript> | Not supported. Define the NoScript section. | 4 | |
| <Object> | Defines the embedded object. | 4 | 5 |
| <Ol> | Define an ordered list. | 4 | 5 |
| <Optgroup> | Define a quota group. | 4 | 5 |
| <Option> | Define the options in the drop-down list. | 4 | 5 |
| <Output> | Defines some types of output. | 5 | |
| <P> | Define a paragraph. | 4 | 5 |
| <Param> | Defines parameters for objects. | 4 | 5 |
| <PRE> | Define pre-formatted text. | 4 | 5 |
| <Progress> | Defines the progress of any type of task. | 5 | |
| <Q> | Define short references. | 4 | 5 |
| <Rule> | Define rules for the upgrade template. | 5 | |
| <S> | Not supported. Defines the text with strikethrough. | 4 | |
| <SAMP> | Define the sample computer code. | 4 | 5 |
| <SCRIPT> | Define scripts. | 4 | 5 |
| <Section> | Define section. | 5 | |
| <SELECT> | Define an optional list. | 4 | 5 |
| <Small> | Not supported. Defines the small text. | 4 | 5 |
| <Source> | Define media sources. | 5 | |
| <Span> | Define the section in the document. | 4 | 5 |
| <Strike> | Not supported. Defines the text with strikethrough. | 4 | |
| <Strong> | Define the emphasized text. | 4 | 5 |
| <Style> | Define style definitions. | 4 | 5 |
| <Sub> | Defines the upper-level text. | 4 | 5 |
| <Sup> | Define subscript text. | 4 | 5 |
| <Table> | Define a table. | 4 | 5 |
| <Tbody> | Define the table body. | 4 | 5 |
| <TD> | Define table units. | 4 | 5 |
| <Textarea> | Define textarea. | 4 | 5 |
| <Tfoot> | Define the footer of the table. | 4 | 5 |
| <TH> | Define the header. | 4 | 5 |
| <Thead> | Define the header. | 4 | 5 |
| <Time> | Defines the date/time. | 5 | |
| <Title> | Define the document title. | 4 | 5 |
| <Tr> | Define table rows. | 4 | 5 |
| <Tt> | Not supported. Define typewriter text. | 4 | |
| <U> | Not supported. Defines the underline text. | 4 | |
| <Ul> | Define an unordered list. | 4 | 5 |
| <Var> | Define variables. | 4 | 5 |
| <Video> | Define a video. | 5 | |
| <XMP> | Not supported. Defines pre-formatted text. | 4 | 5 |
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