Input hidden

<input id="" type="hidden" value="">

If the page is opened so count and put it to the value of hidden input

<form>
  <div>
    <label for="title">Post title:</label>
    <input type="text" id="title" name="title" value="My excellent blog post">
  </div>
  <div>
    <label for="content">Post content:</label>
    <textarea id="content" name="content" cols="60" rows="5">
This is the content of my excellent blog post. I hope you enjoy it!
    </textarea>
  </div>
  <div>
    <button type="submit">Update post</button>
  </div>
  <input type="hidden" id="postId" name="postId" value="34657">
</form>

Source: developer.mozilla.org

If the page is opened so count and put it to the value of hidden input

html {
  font-family: sans-serif;
}

form {
  width: 500px;
}

div {
  display: flex;
  margin-bottom: 10px;
}

label {
  flex: 2;
  line-height: 2;
  text-align: right;
  padding-right: 20px;
}

input, textarea {
  flex: 7;
  font-family: sans-serif;
  font-size: 1.1rem;
  padding: 5px;
}

textarea {
  height: 60px;
}

Source: developer.mozilla.org

Similar codes

269 votes239 views3 answers
Font asweome cdn
Html
4 votes151 views6 answers
Tab content bootstrap 4
Html
63 votes170 views1 answer
How to open link in a new tab
Html
0 vote172 views1 answer
Calendar.js:156 Uncaught TypeError: Cannot set property 'src' of null at HTMLDivElement.<anonymous>
Html
0 vote159 views1 answer
Html disable submit until all required field is complete
Html
24 votes178 views5 answers
Gold Color hash code
Html
0 vote176 views2 answers
Javascript animated alert message box
Html
0 vote168 views1 answer
Wikipedia api url
Html
2 votes197 views1 answer
Name attribute in html
Html
0 vote155 views1 answer
Password setCustomValidity html5
Html