Suzie, it would have been useful if you'd identified the textbook or posted some relevant extract.

Here's what the World Wide Web Consortium (W3C) has to say:

... In certain cases, authors may specify the value of an attribute without any quotation marks. ... We recommend using quotation marks even when it is possible to eliminate them. ...

Extract from: 3.2.2 Attributes

-- Ken

In reply to Re^3: Calling a radio button to the second cgi script by kcott
in thread Calling a radio button to the second cgi script by SuzieB

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