Why in the svelte component when entering text does not change the text length value, but remains equal to 0/1000?

I'm learning Svelte. Wrote a component. When you enter text, the length of the text should be displayed. But for some reason it does not change, but remains equal to 0/1000. If the text length is more than 1000, an error should be shown, but it is not shown. What did I do wrong? Here's the code: enter link description here