Dividend-focused portfolios (DVY, SDY, VYM, VIG, HDV, DLN, IDV) got a bit of stress test over the past few weeks, writes Morningstar's Dan Culloton. The results are what one might have expected: Don't chase yield. The worst performing dividend funds were those having the highest trailing 12-month yield and bigger allocations to favorites like utilities, telecommunications, and real estate. The better-performing funds had larger stakes in healthcare and financials. Also of interest - the top-performers on average invested in stocks with less relative debt on their balance sheets.