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.

constructor(parameters) {
    super(parameters, { ignoreBorder: parameters.data.hasAppearance });
  }
  render() {
    
    
    
    const container = super.render();
    container.className = "buttonWidgetAnnotation pushButton";
    if (this.data.alternativeText) {
      container.title = this.data.alternativeText;
    }
    const linkElement = container.lastChild;
    if (this.enableScripting && this.hasJSActions && linkElement) {
      this._setDefaultPropertiesFromJS(linkElement);
      linkElement.addEventListener("updatefromsandbox", jsEvent => {
        this._dispatchEventFromSandbox({}, jsEvent);
      });
    }
    return container;
  }
}
class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {