Exercise 2: A Missing wp_head() Silently Breaks a Plugin's CSS — Possible Solution
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WHAT wp_head() ACTUALLY DOES, PER THIS CHAPTER
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Per this chapter, "these two hooks [wp_head() and wp_footer()] are how
WordPress core and every installed plugin inject their own scripts and
styles into the page." wp_head() is not merely a formality placed near
the closing tag - it's the literal mechanism plugins use to
insert their own and