Web Programming with html5, css, and JavaScript

FIGUre 6.21B 
body
 container for Local energy web page
(
continues 
)
257
6.13 Case Study: Local Energy and Home Page with Website Navigation

Cogeneration

The hot exhaust and other heat from the engine driving an electric
generator can be used for thermal processes and to heat buildings.
This is called combined heat and power (CHP) or
cogeneration. Heat generated by this means in industrial East
Lawrence could be distributed in insulated underground pipes to
adjacent residences and the central downtown area in what is called
"_blank"> district heating.
Some of the natural gas for CHP plants might be excess methane from
"_blank"> anaerobic digestion at the city's sewage treatment
plant on the east side of East Lawrence. Electricity generated by
CHP at all times of year would help power
East Lawrence
industry and residences. Also, downtown restaurants might
generate some of their electricity with CHP.

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FIGUre 6.21B 
body
 container for Local energy web page (
continued 
)
Power Services web page that does not yet exist. If a user were to use a browser to open the Local 
Energy web page and click on the services link down near the end of the second paragraph, 
the browser would respond unhappily, with a message something like, “This web page is not 
found.” That web page would not be found because it hadn’t been created yet. It won’t be created 
until Chapter 10.
Meanwhile, to avoid user frustration, you could create a “stub” web page that displays 
only a title. But there’s a better strategy. Create a stub web page that redirects the browser to 
a place that already exists and that might provide some satisfaction. In this case, a plausible 
surrogate is the “definition” list item on the Microgrid Possibilities web page developed in the 
case study section at the end of Chapter 4. 
FIGUre 6.22
contains the HTML code for a redi-
recting stub for the not-yet-developed Electric Power Services web page, 
services.html
. 
In the figure, the dashed box surrounds the element that does the redirection. It’s a “refresh” 
meta
element. In the refresh content the 
0;
indicates the time delay before refreshing occurs, 
and the 
url
identifies the new destination. The next subsection includes another illustration 
of redirection.