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:
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在放大到500%后，html2pdf.js 生成的 pdf 文字会出现明显的锯齿，而 dompdf.js 生成的 pdf 文字则完全没有压力。