Attach (recommended) or Link to PDF file [here:] Can't see how to attach a pdf here, but it is simple to create. Add a form object textbox to a pdf and make sure the option for "Multiline" is true.

Steps to reproduce the problem:
1.  Open a document with a Textbox that is set to Multiline.
2. Attempt to hit the Enter key to go to a new line.

What is the expected behavior? The cursor goes to a new line.

What went wrong? It does not go to a new line.

Link to a viewer: It can be reproduced on mozilla.github.io/pdf.js

I corrected the issue by altering the pdf.js file like this
element.addEventListener("keydown", event => { 
[...]
--} else if (event.key === "Enter") {
++ } else if (event.key === "Enter" && !this.data.multiLine) {

Our initial testing is coming through clean, and hopefully something like this code can be committed to the project in the future.

const setColor = (jsName, styleName, event) => {
      const color = event.detail[jsName];
      event.target.style[styleName] = ColorConverters[`${color[0]}_HTML`](
        color.slice(1)
      );
    };
    return shadow(this, "_commonActions", {
      display: event => {
        const hidden = event.detail.display % 2 === 1;
        this.container.style.visibility = hidden ? "hidden" : "visible";
        this.annotationStorage.setValue(this.data.id, {
          hidden,
          print: event.detail.display === 0 || event.detail.display === 3,
        });
      },
      print: event => {
        this.annotationStorage.setValue(this.data.id, {
          print: event.detail.print,
        });
      },
      hidden: event => {
        this.container.style.visibility = event.detail.hidden
          ? "hidden"