These are trends and while important a bit misleading.<p>Yes HTML5 has seen 350,000% increase (yes, I typed that correctly) in job postings over the years, but it is still only in 0.3% of all job postings. Meanwhile C# is in ~1.6% and Java in ~3.3% of all postings.<p>Not saying you shouldn't get some HTML5, MongoDB, Android or iOS knowledge but these are hardly the "most looked for" skills.