spell check has suddenly stopped working on safari..!!

hello people,

i am facing an strage problem since past 2-3 days...the problem is that my ipad and iphone both are not doing spell check (red underline if the spelling is wrong ) particularly on safari..my spell check is enabled because it is working on notes , reminder etc. but not working only on safari..

any fix ?? if not then what could be the reason??

thank u in advance..