Q357 How do I access a form field which has a non alphanumeric name?

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Q357 How do I access a form field which has a non alphanumeric name?

Rather than attempt to access the value of a form field called 'a.b.c.d' using:

document.formName.a.b.c.d.value = 'testing';

use:

document.formName.elements['a.b.c.d'].value = 'testing';