fmt.Printf("\rFlashing: %d/%d bytes (%.0f%%)", current, total,
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，更多细节参见哔哩哔哩
If we don’t do this with lists, if we don’t make += do the in place assignment, if we don’t leave it open for types to do their own thing, depending on the circumstances, then there’s no value in += in the first place, because it’s just syntactic sugar for +.
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The root cause? We drive Chrome's rendering loop frame-by-frame rather than letting it render freely. If no frames are issued for a while, internal buffers go stale. The fix is a warmup loop that continuously issues "skip frames" at ~30fps while waiting for the page to signal it's ready to record: