ex08

Exercise 5.8 (P134)

Modify forEachNode so that the pre and post functions return a boolean result indicating whether to continue the traversal. Use it to write a function ElementByID with the following signature that finds the first HTML element with the specified id attribute. The function should stop the traversal as soon as a match is found.

    func ElementByID(doc *html.Node, id string) *html.Node