🐛 amp-mathml: Add support for non-block mode; fixes #19420

[KENNYSOFT]

Closes #19420 : <amp-mathml> to support for non-block mode.

The example document with the next source is rendered as the next figure.

  <h2>The Quadratic Formula</h2>
  <amp-mathml
    layout="container"
    data-formula="\[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\]">
  </amp-mathml>
  <h2>Cauchy's Integral Formula</h2>
  <amp-mathml
    layout="container"
    data-formula="\[f(a) = \frac{1}{2\pi i} \oint\frac{f(z)}{z-a}dz\]">
  </amp-mathml>
  <h2>Double angle formula for Cosines</h2>
  <amp-mathml
    layout="container"
    data-formula="$$ \cos(θ+φ)=\cos(θ)\cos(φ)−\sin(θ)\sin(φ) $$">
  </amp-mathml>
  <h2>Inline formula</h2>
  <p>This is an example of a formula of <amp-mathml layout="container" inline data-formula="`x`"></amp-mathml>, <amp-mathml layout="container" inline data-formula="\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)"></amp-mathml> placed inline in the middle of a block of text. <amp-mathml layout="container" inline data-formula="\( \cos(θ+φ) \)"></amp-mathml> This shows how the formula will fit inside a block of text and can be styled with CSS.</p>

[KENNYSOFT]

Hmm, have no idea why CI fails... 😢

[aghassemi]

Thanks for the PR! I am currently on vacation and will review when I return middle of next week. Sorry for the delay.

[aghassemi]

Great PR! Thank you @KENNYSOFT . I will merge as soon as unit test pass( failed due to a flake, I am re-running them now)

[KENNYSOFT]

I see. Thanks for confirming. 😆

[KENNYSOFT]

🎉