Please design the webpage with the generic font families in mind...
"serif", "sans-serif", "cursive", "fantasy", "monospace"

sans-serif which often will result in Arial or Helvetica is in my eyes the way to go...

Later on when the design is finished I don't mind if more special fonts are used. But that makes only sense when they are available on close to 90% of the systems.
This page might help to find out which will be most commonly available and its generic matches:
Code Style: Font code sampler for CSS font-family properties and Web fonts

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