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The weight slider adapts to the font you're using -- some fonts support more steps than others. With the default font or Publisher Font, there are only two stops (Normal and Bold) because those fonts only ship two weights.
If you want more granular control, try switching to one of the variable fonts like Literata, Noto Serif, or Atkinson Hyperlegible. Those give you five weight steps from Lightest through Boldest. Merriweather and Lora also have intermediate steps.
It works this way because setting a weight the font doesn't actually have just gets clamped by the browser to the nearest available weight -- you'd see the slider move but nothing change on screen. So the stops are limited to what each font genuinely supports.
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