On default Debian KED installation, the Chinese characters on some websites, e.g. www.baidu.com, are not properly displayed. With the font inspector in Chromium, I can see that some Japanese fonts are selected for them. I suspect that the website doesn’t specify a proper fall back Chinese font if the top choice is unavailable. Since Google Noto fonts are installed by default on most platforms, I could set them as the fallback. After editing the config file as shown below, and the issue goes away.

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# in ~/.config/fontconfig/fonts.conf
<fontconfig>
...
 <alias>
 	<family>sans-serif</family>
	<prefer>
		<family>Noto Sans</family>
		<family>Noto Sans CJK SC</family>
	</prefer>
 </alias>
 <alias>
 	<family>monospace</family>
	<prefer>
		<family>Noto Sans Mono</family>
		<family>Noto Sans Mono CJK SC</family>
	</prefer>
 </alias>
</fontconfig>