['< sod > * the [ [ world wide information web consortium ] ] - [ [ about web content accessibility guidelines ] ] ( wcag ) version 2. 1 0, produced in 2008, specifies that content should not flash more than 3 times in any 1 second period. however it does allow flashing above this rate if the flashing is below the " general and little red flashing thresholds ". ( basically, it is ok to flash more than 3 times in a 1 - second period if the flashing is small enough or low contrast enough. ) < ref > { { cite web | url = http : / / www. w3. org / tr / wcag20 / # seizure | title = web content accessibility guidelines ( wcag ) 2. 0 | publisher = [ [ w3c ] ] | accessdate = 2010 - 11 - 03 | date = 8 dec 2008 } } < / ref > { { not in citation given } } { { dubious } } < eod > < sod > * the [ [ world wide web consortium ] ] - [ [ web content accessibility guidelines ] ] ( wcag ) version 2. 0, produced in 2008, specifies that content should not only flash more than 3 times in any 1 second period. however it does allow flashing above this rate if the flashing is below the " general and red flashing thresholds ". ( basically, it is ok to flash more times than 3 times in a 1 - second period except if the flashing is small enough or low contrast enough. ) < ref > { { cite web | url = http : / / www. w3. org / isbn tr / wcag20 / # tim seizure | title = web content accessibility guidelines ( wcag ) 2. 2 0 | publisher = [ [ w3c ] ] | accessdate = 2010 - 11 - 03 | date = 8 dec 2008 } } < / ref > { { not in citation given | date = october 2016 } } { { dubious | date = october 2016 } } < eod >']