FRAME - Frame

Syntax

<FRAME>

Attribute Specifications

NAME=CDATA (name of frame)
SRC=url (content of frame)
LONGDESC=url (long description of frame)
FRAMEBORDER=[ 1 | 0 ] (frame border)
MARGINWIDTH=Pixels (margin width)
MARGINHEIGHT=Pixels (margin height)
NORESIZE (disallow frame resizing)
SCROLLING=[ yes | no | auto ] (ability to scroll)
[4.0] ID=string
[4.0] CLASS=string
[4.0] STYLE=string
[4.0] TITLE=string
[4.0] LANG=Language (i.e. RU - Russian)
[4.0] DIR=ltr|rtl
[4.0] SCRIPTING EVENTS=string

Contents

Empty

Contained in

FRAMESET

Description

The FRAME element defines a frame--a rectangular subspace within a Frameset document. Each FRAME must be contained within a FRAMESET that defines the dimensions of the frame.

SRC & LONGDESC

The SRC attribute provides the url of the frame's content, which is typically an HTML document. If the frame's content is an image, video, or similar object, and if the object cannot be described adequately using the TITLE attribute of FRAME, then authors should use the LONGDESC attribute to provide the url of a full HTML description of the object.

For better accessibility to disabled users and better indexing with search engines, authors should not use an image or similar object as the content of a frame. Rather, the object should be embedded within an HTML document to allow the indexing of keywords and easier provision of alternate content.

NAME

The NAME attribute gives a name to the frame for use with the TARGET attribute of the A, AREA, BASE, FORM, and LINK elements. The NAME attribute value must begin with a character in the range A-Z or a-z.

The NAME should be human-readable and based on the content of the frame since non-windows browsers may use the NAME as a title for presenting a list of frames to the user. For example, NAME=left would be inappropriate since it says nothing about the content while NAME=nav would be inappropriate since it is not very human-readable. More suitable would be NAME=Content and NAME=Navigation. The TITLE attribute can also be used to provide a slightly longer title for the frame, though this is not widely supported by current browsers.

An example follows:

<FRAMESET ROWS="*,100">
  <FRAMESET COLS="40%,*">
    <FRAME NAME="Menu" SRC="nav.html" TITLE="Menu">
    <FRAME NAME="Content" SRC="main.html" TITLE="Content">
  </FRAMESET>
  <FRAME NAME="Ad" SRC="ad.html" TITLE="Advertisement">
  <NOFRAMES>
    <BODY>
      <H1>Table of Contents</H1>
      <UL>
        <LI>
          <A HREF="reference/html40/">HTML 4.0 Reference</A>
        </LI>
        <LI>
          <A HREF="reference/wilbur/">HTML 3.2 Reference</A>
        </LI>
        <LI>
          <A HREF="reference/css/">CSS Guide</A>
        </LI>
      </UL>
      <P>
        <IMG SRC="ad.gif" ALT="Ad: Does your bank charge too much?">
      </P>
    </BODY>
  </NOFRAMES>
</FRAMESET>

The FRAME element also accepts a number of attributes to specify the presentation on visual browsers. Style sheets provide a more flexible method of defining the presentation of frames, but the element's presentational attributes are more widely supported.

FRAMEBORDER

The FRAMEBORDER attribute specifies whether or not the frame has a visible border. The default value, 1, tells the browser to draw a border between the frame and all adjoining frames. The value 0 indicates that no border should be drawn, though borders from other frames will override this.

To fully remove the border, some browsers also require the use of other, non-standard attributes. See How do I remove the border around frames? for more details.

Note that removing the border of a frame takes away the user's ability to resize the frame on most browsers.

MARGINWIDTH & MARGINHEIGHT

The MARGINWIDTH and MARGINHEIGHT attributes define the number of pixels to use as the left/right margins and top/bottom margins, respectively, within the frame. The value must be greater than one pixel.

NORESIZE

The boolean NORESIZE attribute prevents the user from resizing the frame. This attribute should never be used in a user-friendly Web site.

SCROLLING

The SCROLLING attribute specifies whether scrollbars are provided for the frame. The default value, auto, generates scrollbars only when necessary. The value yes gives scrollbars at all times, and the value no suppresses scrollbars--even when they are needed to see all the content. The value no should never be used.

[4.0] ID

The ID attribute uniquely identifies an element within a document. No two elements can have the same ID value in a single document. The attribute's value must begin with a letter in the range A-Z or a-z and may be followed by letters (A-Za-z), digits (0-9), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

The following example uses the ID attribute to identify each of the first two paragraphs of a document:

<P ID=firstp>My first paragraph.</P>
<P ID=second>My second paragaph.</P>

The paragraphs in the example could have style rules associated with them through their ID attributes. The following Cascading Style Sheet defines unique colors for the two paragraphs:

P#firstp {
  color: navy;
  background: transparent
}

P#secondp {
  color: black;
  background: transparent
}

The paragraphs in the initial example could also be used as a target anchor for links:

<P>See <A HREF="#firstp">the opening paragraph</A> for more information.</P>

Note that most browsers do not support the ID attribute for link anchors. For current browsers, authors should use <A NAME>...</A> within the element instead of ID.

Since ID and NAME share the same name space, authors cannot use the same value for an ID attribute and a NAME attribute in the same document. Also note that while NAME may contain entities, the ID attribute value may not.

[4.0] CLASS

The CLASS attribute specifies the element to be a member of one or more classes. Classes allow authors to define specific kinds of a given element. For example, an author could use <CODE CLASS=Java> when giving Java code and <CODE CLASS=Perl> when giving Perl code.

Unlike with the ID attribute, any number of elements can share the same class. An element may also belong to multiple classes; the CLASS attribute value is a space-separated list of class names.

Note that most current browsers do not support multiple classes. Such browsers typically ignore a CLASS attribute that specifies multiple classes.

The CLASS attribute is particularly useful when combined with style sheets. For example, consider the following navigation bar:

<DIV CLASS=navbar>
<P><A HREF="/">Home</A> | <A HREF="./">Index</A> | <A HREF="/search.html">Search</A></P>
<P><A HREF="/"><IMG SRC="logo.gif" ALT="" TITLE="WDG Logo"></A></P>
</DIV>

This example's use of the CLASS attribute allows style rules to easily be added. The following Cascading Style Sheet suggests a presentation for the preceding example:

.navbar {
  margin-top: 2em;
  padding-top: 1em;
  border-top: solid thin navy
}

.navbar IMG { float: right }

@media print {
  .navbar { display: none }
}
[4.0] STYLE

The STYLE attribute allows authors to specify style rules inline for a single occurrence of an element. An example follows:

<P>A popular font for on-screen reading is <SPAN STYLE="font-family: Verdana">Verdana</SPAN>.</P>

When the STYLE attribute is used, a default style sheet language must be specified for the document by setting the Content-Style-Type HTTP header to the media type of the style sheet language. The previous example could use the following META element in the document's HEAD:

<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">

In most cases, use of the CLASS or ID attributes is a better choice than using STYLE since ID and CLASS can be selectively applied to different media and since they provide a separation of content and presentation that often simplifies maintenance.

[4.0] TITLE

The TITLE attribute provides a title for an element and is commonly implemented as a "tooltip" on visual browsers, though many browsers lack support for TITLE. The attribute is most useful with A, LINK, IMG, and OBJECT elements, where it provides a title for the linked or embedded resource. Some examples follow:

TITLE is also helpful with the ABBR and ACRONYM elements to provide the long form of the abbreviation. Examples:

Internationalization Attributes

[4.0] LANG

The LANG attribute specifies the language of an element's attribute values and its content, including all contained elements that do not specify their own LANG attribute. While the LANG attribute is not widely supported, its use may help search engines index a document by its language while allowing speech synthesizers to use language-dependent pronunciation rules. As well, visual browsers can use the language's proper quotation marks when rendering the Q element.

The attribute value is case-insensitive, and should be specified according to RFC 1766; examples include en for English, en-US for American English, and ja for Japanese. Whitespace is not allowed in the language code.

Use of the LANG attribute also allows authors to easily change the style of text depending on the language. For example, a bilingual document may have one language in italics if rendered visually or a different voice if rendered aurally. The HTML of such a document might be as follows:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
   "http://www.w3.org/TR/REC-html40/strict.dtd">
<TITLE>Welcome - Bienvenue</TITLE>
<H1>
  <SPAN LANG=en>Welcome</SPAN> -
  <SPAN LANG=fr>Bienvenue</SPAN>
</H1>
<P LANG=en>This paragraph is in English.</P>
<P LANG=fr>Ce paragraphe est en français.</P>
...

A document's primary language may be set using the LANG attribute on the HTML element, or, alternatively, by using the Content-Language HTTP header.

[4.0] DIR

The DIR attribute specifies the directionality of text--left-to-right (DIR=ltr, the default) or right-to-left (DIR=rtl). Characters in Unicode are assigned a directionality, left-to-right or right-to-left, to allow the text to be rendered properly. For example, while English characters are presented left-to-right, Hebrew characters are presented right-to-left.

Unicode defines a bidirectional algorithm that must be applied whenever a document contains right-to-left characters. While this algorithm usually gives the proper presentation, some situations leave directionally neutral text and require the DIR attribute to specify the base directionality.

Text is often directionally neutral when there are multiple embeddings of content with a different directionality. For example, an English sentence that contains a Hebrew phrase that contains an English quotation would require the DIR attribute to define the directionality of the Hebrew phrase. The Hebrew phrase, including the English quotation, should be contained within a SPAN element with DIR=rtl.

[4.0] Scripting Events

A number of attributes that define client-side scripting events are common to most elements. The attribute value is a script--typically a function call or a few short statements--that is executed when the event occurs. The value may contain entities (e.g., &quot;).

The following example features JavaScript code to handle two events of a submit button, giving the user a reminder in the status bar when the mouse moves over the button and clearing the status bar when the mouse moves away. Note that the attribute values are delimited by single quotes since double quotes are used within them.

<INPUT TYPE=submit ONMOUSEOVER='window.status="Did you fill in all required fields?";' ONMOUSEOUT='window.status="";'>

When an event attribute is used, a default scripting language must be specified for the document by setting the Content-Script-Type HTTP header to the media type of the scripting language. The previous example could use the following META element in the document's HEAD:

<META HTTP-EQUIV="Content-Script-Type" CONTENT="text/javascript">

The common event attributes are device-dependent and largely tailored for the graphical user interface. The available events are as follows:

More Information

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