Html5 Input Type Range Show Range Value

function updateTextInput(val) {          document.getElementById('textInput').value=val;         }

<input type="range" name="rangeInput" min="0" max="100" onchange="updateTextInput(this.value);"><input type="text" id="textInput" value="">

How do I show the value beside an HTML5 range input type?

attach to it onChange event
and in the event handler function you can select the value of the
and write it as innerHtml to a span beside the controller

<input id="mine" type="range" min="-100" max="100" value="0" step="10" onChange="change();"> <span id="result"></span>

<script>
var result = document.getElementById("result");
var mine = document.getElementById("mine");
function change(){
    result.innerText = mine.value;
}
</script>

HTML Input range type becomes un-usable by drag action if highlighted in chrome

After a little tinkering I was able to stop this behavior with the following JS:

document.querySelectorAll('input[type="range"]').forEach((input) => { 
    input.addEventListener('mousedown',  () => window.getSelection().removeAllRanges());
});

Why my function to change a grid element to the size of an input of type range doesn't work?

The problem is that you are defining the boardSize variable in the showSize function so that variable is only available in the scope of that function. Please read the following:
https://www.w3schools.com/js/js_scope.asp

I suggest you do the following.

document.querySelector(".set").addEventListener("click", () => {
    let boardSize = document.querySelector(".show-size").innerHTML;
    populateBoard(boardSize);
});

function setSize(value) {
    document.querySelector(".show-size").innerHTML = value;
}

Some errors you have is setting the event listener in a function.
I would just have a function to set the board size as seen above and then the event listener to populate the board onclick of the set size button.

html5 input type range always pointing to min value and not getting onChange on text input

Below code will solve your problems, only use single state object to display value in both controls now it will works in both way either change value on input or slider.

class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      value: ""
    };
  }

  handleSliderChange = (event) => {
    var value = event.target.value;
    var slidervalue = parseInt(value);
    this.setState({ value: slidervalue });
  }

  handleInputChanged = (event) => {
    var value = event.target.validity.valid
      ? event.target.value
      : this.state.value;
    this.setState(
      {
        value: value
      });
  }
  render() {
    let LowerBound = 0;
    let UpperBound = 200
    return (
      <div>
        <button onClick={this.handleCopy}>click me</button>
        <div className="SettingsTreeValueNode__InputField">
          <input
            type="text"
            pattern="[0-9]*"
            ref="text"
            value={this.state.value}
            onInput={this.handleInputChanged}
            className="inputtext"
          />
          {LowerBound}
          <input
            type="range"
            className="sliderinput"
            defaultValue="200"
            min="0"
            max="200"
            step="1"
            value={this.state.value ? this.state.value : UpperBound}
            onInput={this.handleSliderChange}
          />
          {UpperBound}
        </div>
      </div>
    );
  }
}
export default App;

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