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Creating Websites for the 4630 IP Telephone
Browser Features and Behavior
B-7
Images 5
The 4630 IP Telephone Web Browser handles both GIF and JPEG image formats. No other image
formats, included animated GIFs, are supported. Note that images take up a large amount of
memory (compared to text) and updating the display can be an issue; therefore, it is recommended
that images be kept to a minimum.
The image tags that may be used on the browser are as follows:
■ <img> displays an image.
■ <map> display a client-side image. Client-side images have shaped regions called areas.
These areas are tied to URLs or ECMAScript functions. When an area in a region is clicked,
the ECMAScript function is executed.
■ <area> defines an area in a <map> image. Each area uses the href attribute to define a URL
to jump to, or some ECMAScript to execute, when the mouse is clicked on that area.
See the Design Guidelines
section for information on displaying images.
Links 5
Hyperlinks are the heart of the web browser’s power. The link is what allows the user to click on
some text or an image to jump to another web site, another page within this site, or another area in
this page. Although URLs allow various protocols to be used, only http and https should be used
for the 4630 IP Telephone Web Browser.
■ <a> specifies the full or relative URL for a hyperlink. When using the target attribute, the
_blank name should never be used. With the exception of frames, the 4630 IP Telephone Web
Browser is not intended to be a multi-window browser. Thus, if a page attempts to reference a
new, non-frame window, the browser will become confused and a reboot will be necessary.
■ <base> defines the default target to be used in all <a> tags. This is done by setting the target
attribute of the <base> tag. If the target attribute has been set in the <a> tag, the <base> tag
value is ignored.
The use of the target attribute with the Web Access Application is strongly discouraged because
the application supports a single window for browsing. The use of the target attribute may cause
the browser software to create a new window that is outside of the Web Access Application's
control.