which poem do the following lines come from?

Googling I came up with the following;;

THE LADY OF SHALOTT AND THE AUDIO-VISUAL IMAGINATION

MARGARITA CARRETERO GONZÁLEZUniversidad de Granada

I decided that it was time to open the boxand watch the first episode, “Old, Unhappy, Far Off Things”. I could hardly believe my ears when, in the last minute of the film, DS Hathaway, Lewis’sextremely intelligent and learned assistant, quoted from Tennyson’s poem: “Outflew the web and floated wide”. Lewis recognises the line but wonders what brought it to Hathaways’s mind. “A pure and virtuous maiden cursed to fall inlove and die half-mad for the want of it” is Hathaway’s reply, thus explaining thereasons that led the murderer in this episode to kill her lover and, years later,immolate herself.

I'm sure it's not from Shakespeare. It doesn't sound like it actually is from a poem to me... it sounds more like an analysis of a character - maybe Ophelia? The Lady of Shalott? Even maybe Bertha Rochester or Miss Havisham? Not certain... it just somehow doesn't sound like a poetic quote to me.