On the home page, white text/a white text read: Welcome to Maggie's Blog.
Should it be text or a text here? And why?
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Sign up to join this community"a text" is not correct or appropriate here. Text, in the countable noun sense, means something like "a piece of writing like a book or play; a body of work" A few words on a page isn't really "a text". - Credits to @stangdon
"text" should be correct in this context.