Comments: HTML 5 common syntax Overview (list unsupported attributes)
HTML header tag
| Mark | Description | HTML5 Standard |
| <Base> | Define the reference URLs of all links on the page | |
| <Title> | Set the title content displayed in the upper-left corner of the browser | |
| <Isindex> | Indicates that this document is a gateway script that can be used for retrieval. | Not Supported |
| <Meta> | Meta Information of the document, such as query keywords and Validity Period | |
| <Style> | Set CSS Cascading Style Sheet content | |
| <Link> | Set external resource links | |
| <Script> | Page script content |
Metadata tag <meta> attribute
| Mark | Description | Value | HTML5 Standard |
| Http-equiv | Generate an HTTP standard domain and associate the Content attribute with the HTTP header. |
Content-type/expires/refresh/set-cookie |
|
| Name | Associate the content attribute with a name |
Author/description/keywords/generator/revised/others |
|
| Content | Defines metadata keywords/values related to http-equiv or name attributes | ||
| Charset | Document character encoding | Add attribute |
Note: The scheme attribute is not supported in HTML5. The charset attribute is added. For details, see HTML5 <meta> label.
HTML subject tag <body> attribute
| Attribute | Description | HTML5 Standard |
| Text | Set page text color | Delete |
| Bgcolor | Set page background color | Delete |
| Background | Set page background image | Delete |
| Bgproperties | Set the background image of the page to be fixed and do not scroll with the page | Delete |
| Link | Set the default link color of the page | Delete |
| Alink | Set the link color when the mouse is clicked | Delete |
| Vlink | Set the link color after access | Delete |
| Topmargin | Set the top margin of the page | Delete |
| Leftmargin | Set the left margin of the page | Delete |
Note: In HTML 5, all special attributes of <body> are deleted. For details, see HTML5 <body> labels.
Special symbols
| Special symbols | Rune number |
| " | & Quot; |
| & | & Amp; |
| < | & Lt; |
| > | & Gt; |
| © | & Copy; |
| ® | & Reg; |
| ± | & Plusmn; |
| × | & Times; |
| § | & Sect; |
| Bytes | & Cent; |
| ¥ | & Yen; |
| · | & Middot; |
| & Euro; | |
| £. | & Pound; |
| ™ | & Trade; |
Title word mark
| Mark | Description |
| <H1>... | Level 1 title |
| <H2>... | Level 2 Title |
| <H3>... | Level 3 title |
| <H4>... | Level 4 title |
| <H5>... | Level 5 Title |
| <H6>... | Level 6 Title |
Note: For more information, see HTML5
In HTML 4.01, the "align" attribute of the h1-h6 element is not supported.
In HTML 5, the "align" attribute of the h1-h6 element is not supported.
Text Modifier
| Mark | Description | HTML5 Standard |
| <B> | Bold | |
| <Strong> | Bold | |
| <I> | Italics | |
| <Em> | Italics | |
| <Cite> | Italics | |
| <Sup> | Superscript | |
| <Sub> | Subscript | |
| <Big> | Font Size | Not Supported |
| <Small> | Small font size | Not Supported |
| <U> | Underline | Not Supported |
| <S> | Strikethrough | Not Supported |
| <Strike> | Strikethrough | Not Supported |
| <Address> | Address | |
| <Tt> | Typewriter text | Not Supported |
| <Blink> | Flashing Text (only available in the Netscape browser) | Not Supported |
| <Code> | Equal width | |
| <Samp> | Equal width | |
| <Kbd> | Enter text on the keyboard | |
| <Var> | Declare Variables |
Font Tag <font> attribute
| Attribute | Description | HTML5 Standard |
| Face | Font | Not Supported |
| Size | Font Size | Not Supported |
| Color | Color | Not Supported |
Note: See HTML 5 <font> labels.
This element is not supported in HTML 4.01.
This element is not supported in HTML 5, but can be inserted in the WYSIWYG editor.
In HTML 5, only the style attribute is supported.
List tag
| Mark | Description | HTML5 Standard |
| <Ul> | Unordered list | |
| <Ol> | Ordered list | |
| <Dir> | Directory List | Not Supported |
| <Dl> | Definition list | |
| <Menu> | Menu list | Redefinition; used to arrange Form Controls |
<Dt>, <dd> |
Define the tag of the List | |
| <Li> | Mark a list item |
Hyperlink tag
| Attribute | Description | HTML5 Standard |
| Href | Link address | |
| Name | Name the link | Naming an anchor is not supported. Use id instead. |
| Title | Prompt text for Link | |
| Target | Target window of the specified Link |
Link target window property target
| Attribute Value | Description |
| _ Parent | Open in the upper-level window. Generally, frame pages are often used. |
| _ Blank | Open in new window |
| _ Self | Open in the same frame or window, default |
| _ Top | Open in the entire window of the browser and ignore any framework |
Image Tag attribute
| Attribute | Description | HTML5 Standard |
| Src | Source image files | |
| Alt | Prompt text | |
| Width and height | Width and height | |
| Border | Border | Not Supported |
| Vspace | Vertical spacing | Not Supported |
| Hspace | Horizontal spacing | Not Supported |
| Align | Arrange | Not Supported |
Align attribute values
| Attribute Value | Description | HTML5 Standard |
| Top | The middle line of the text is above the image | |
| Middle | The middle line of the text is in the middle of the image | |
| Bottom | The middle line of the text is at the bottom of the image | |
| Left | The image is on the left side of the text. | |
| Right | The image is on the right of the text | |
| Absbottom | Bottom line of text is at the bottom of the image | |
| Absmiddle | Bottom line of text in the middle of the image | |
| Baseline | English text baseline alignment | |
| Texttop | Alignment of English text |
Note: Please view the HTML 5 tag
Table tag
| Mark | Description |
| <Table>... </table> | Table tag |
| <Tr>... </tr> | Row mark |
| <Td>... </td> | Cell tag |
Note: In HTML 5,
Any attribute of the <table> label is not supported.
Any attribute of the <tr> label is not supported.
Only the <td> <th> label "colspan" and "rowspan" attributes are supported.
Form tag <form> attribute
Note:
There is a new attribute in HTML 5: replace. It defines what the form will do after it is submitted.
Form tag <form> element
| Mark | Description | HTML5 Standard |
| <Input> | Form input tag | The type attribute has many new values. |
| <Select> | Menu and list tag | New attribute |
| <Option> | Menu and list item tag | It can be used in the new element <datalist> |
| <Textarea> | Text Field mark | New attribute |
Enter the value of <input> tag attribute Type
| <Input Type = "property value"/> | Description | HTML5 Standard |
| Text | Text Field | |
| Password | Password domain | |
| File | File domain | |
| Checkbox | Check box | |
| Radio | Single region | |
| Button | Normal button | |
| Submit | Submit button | |
| Reset | Reset button | |
| Hidden | Hide domain | |
| Image | Image domain (image submission button) |
Frame tag
| Frame tag | Description | HTML5 Standard |
| <Frameset> | Framework set | Not Supported |
| <Frame> | Framework | Not Supported |
| <Iframe> | Inline framework | Only the src attribute is supported. |
| <Noframe> | No Frame | Not Supported |
Note: See the HTML 5 <frameset> tag.
The <frameset> tag in HTML 5 is not supported because of its negative impact on web page availability.
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