What is the command to precisely control the font size?

What is the command to precisely control the font size? In my own program, the font is slightly larger. But I think the word break on Weibo is exactly the same size. However, I use commands to control it, either big or small.

Is there any way to precisely control the font size? Final granularity to LBS, or pixels.

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Css: font-size?

When I select a font, the font size is larger than that of NetEase Blog. when the font size is 2, the font size is smaller than that of NetEase Blog. And it's too small. What should I do? How is the font size controlled by NetEase Blog?

Css: font-size?
It seems that I want to learn CSS. does CSS belong to HTML? Can I talk about it in the HTML tutorial?

What do you mean ?!

Then you can see how its css is written and view it with firebug.

Then you can see how its css is written and view it with firebug.
Could you please write me a code that controls the font size with the pound value or the pixel value? As if it was being written, and then used in </body>?

Thanks, I have already found a method. after trying, I found that setting the font to 15 lbs and the font spacing to-1 is exactly the same as that of NetEase.

Search for the css font-size usage.