改变360浏览器网页的字体大小的具体操作步骤如下：
1、首先我们打开360浏览器，点击右上角“三”图标选项。
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2、然后我们在该页面中点击“设置”选项。
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3、之后我们在该页面中点击“高级设置”选项。
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4、然后我们在该页面中点击“自定义字体”选项。
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https://iknow-pic.cdn.bcebos.com/d53f8794a4c27d1e6e39067e15d5ad6eddc43868"/>
5、最后我们在该页面中通过上面的标准字体滑块，来设置网页的字体大小即可。
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https://iknow-pic.cdn.bcebos.com/ac6eddc451da81cbfbd6bf775c66d01609243153"/>