```{python}
#| echo: false
#| output: asis
# library
import asyncio
from playwright.async_api import async_playwright
async def JXG2SVG(jscode,id='jxgbox',width="500px",height="500px",box=[-5,5,5,-5],axis=True,board='board'):
opt={
'id': id,
'width':width,
'height':height,
'box': box,
'axis': axis,
'board': board,
'jscode':jscode
}
html=f"""
"""
playwright = await async_playwright().start()
browser = await playwright.chromium.launch(headless = True)
page = await browser.new_page()
await page.set_content(html)
svg = await page.evaluate('() => svg')
return svg
jscode=r"""board.suspendUpdate();
var p = [];
p[0] = board.create('point', [-1,-2], {size:2});
p[1] = board.create('point', [6,5], {size:2});
p[2] = board.create('point', [-0.5,1], {size:2});
p[3] = board.create('point', [3,3], {size:2});
var f = JXG.Math.Numerics.lagrangePolynomial(p);
var graph = board.create('functiongraph', [f,-10, 10]);
var g = function(x) {
return JXG.Math.Numerics.D(f)(x)-(p[1].Y()-p[0].Y())/(p[1].X()-p[0].X());
};
var r = board.create('glider', [
function() { return JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5); },
function() { return f(JXG.Math.Numerics.root(g,(p[0].X()+p[1].X())*0.5)); },
graph], {name:' ',size:4,fixed:true});
board.create('tangent', [r], {strokeColor:'red'});
var line = board.create('line',[p[0],p[1]],{strokeColor:'red',dash:1});
board.unsuspendUpdate();
"""
svg = await JXG2SVG(jscode,width="600px",height="400px",box=[-5,10,7,-6])
print(svg)
```