Unicode-Support

[Syndesi]

Hi,

when I'm using special letters like äöü in \text{}, the while equation will not be rendered :( But it worked with Katex's demo (added \text{äöü} to the black box) so I think that the bug may be in this package.

[moriyuu]

I want it too!!

[waylonflinn]

Thanks for bringing this to my attention. Hopefully I'll get some time in the next few weeks to fix a few of these outstanding items.

[Syndesi]

Actually this bug is more than just "language support": As in the Katex-documentation writen, some symbols must be written in Unicode. Therefore this formula will brake at this moment:

$\frac{a}{b} a, b ∈ ℕ$

[Syndesi]

I now looked into the code and found out that katex don't return a string when the latex-input contains these characters. Updating the packages led to compatibility issues and even when these were fixed (with webpack instead of watchify), the reported bug still exists. Therefore I think that the issue is more related to katex itself than to this project. And indeed, they have currently some related errors: #895 and #979. At least they are working on a bugfix...

But their demo is working with the expression $\frac{a}{b} a, b ∈ ℕ$. Therefore I'm currently more confused than anything else :/

[kevinbarabash]

It's possible the version that's on the demo is ahead what got released in the most current published package. My apologies if that's the case.

[Syndesi]

Hey, they completed the bugfix and the current alpha-build (without the new commit) can now render Unicode (yeah! :D ). But there are now other problems, e.g. fractions are now rendered with a huge black element in the background. But because I'm using a alpha version, I think this will be removed soon :P

And this is the source code of the generated expression:

<span class="katex">
  <span class="katex-mathml">
    <math>
      <semantics>
        <mrow>
          <mfrac>
            <mrow>
              <mi>a</mi>
            </mrow>
            <mrow>
              <mi>b</mi>
            </mrow>
          </mfrac>
          <mi>a</mi>
          <mo separator="true">,</mo>
          <mi>b</mi>
          <mo>∈</mo>
          <mrow>
            <mi mathvariant="double-struck">N</mi>
          </mrow>
        </mrow>
        <annotation encoding="application/x-tex">\frac{a}{b} a, b ∈ ℕ</annotation>
      </semantics>
    </math>
  </span>
  <span class="katex-html" aria-hidden="true">
    <span class="strut" style="height:0.695392em;"></span>
    <span class="strut bottom" style="height:1.040392em;vertical-align:-0.345em;"></span>
    <span class="base">
      <span class="mord">
        <span class="mopen nulldelimiter"></span>
        <span class="mfrac">
          <span class="vlist-t vlist-t2">
            <span class="vlist-r">
              <span class="vlist" style="height:0.695392em;">
                <span style="top:-2.6550000000000002em;">
                  <span class="pstrut" style="height:3em;"></span>
                  <span class="sizing reset-size6 size3 mtight">
                    <span class="mord mtight">
                      <span class="mord mathit mtight">b</span>
                    </span>
                  </span>
                </span>
                <span style="top:-3.23em;">
                  <span class="pstrut" style="height:3em;"></span>
                  <span class="frac-line hide-tail" style="height:0.04em;">
                    <svg width="400em" height="400em" viewBox="0 0 400000 400000" preserveAspectRatio="xMinYMin slice">
                      <path d="M0 0 h400000 v400000 h-400000z M0 0 h400000 v400000 h-400000z"></path>
                    </svg>
                  </span>
                </span>
                <span style="top:-3.394em;">
                  <span class="pstrut" style="height:3em;"></span>
                  <span class="sizing reset-size6 size3 mtight">
                    <span class="mord mtight">
                      <span class="mord mathit mtight">a</span>
                    </span>
                  </span>
                </span>
              </span>
              <span class="vlist-s">​</span>
            </span>
            <span class="vlist-r">
              <span class="vlist" style="height:0.345em;"></span>
            </span>
          </span>
        </span>
        <span class="mclose nulldelimiter"></span>
      </span>
      <span class="mord mathit">a</span>
      <span class="mpunct">,</span>
      <span class="mord mathit">b</span>
      <span class="mrel">∈</span>
      <span class="mord">
        <span class="mord mathbb">N</span>
      </span>
    </span>
  </span>
</span>

The black element is created by this line: <path d="M0 0 h400000 v400000 h-400000z M0 0 h400000 v400000 h-400000z"></path>

[kevinbarabash]

@Syndesi the classes on <span class="frac-line hide-tail" style="height:0.04em;"> should be clipping that rectangle.

[zackw]

The bad rendering of \text{äöü} appears to be fixed in KaTeX 0.16.x. The rendering of ℕ is improved in 0.16.x but still not 100% correct, see https://github.com/KaTeX/KaTeX/issues/3755.