When you think you're finished but there's still crossbrowser and responsive/adaptive work to do.

Yup, think about responsiveness from the start..

@rEaL-jAsE the to tired wasn't me. Internet memes.

I asked them if mobile or desktop first. They said both are equally important but since their clients are mostly desktop, desktop first. I thought about if from the start but I made it responsive afterwards. yes. Also, I'm not professional.