Creating a complete Instagram hashtag generator involves multiple components, including HTML for the user interface, JavaScript for generating hashtags, and CSS for styling. Below is a simplified example to get you started:

HTML (index.html):
```html
<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
    <div class="container">
        <h1>Instagram Hashtag Generator</h1>
        <div class="input-container">
            <label for="keyword">Enter a Keyword:</label>
            <input type="text" id="keyword" placeholder="e.g., travel, food">
            <button onclick="generateHashtags()">Generate Hashtags</button>
        </div>
        <div class="output-container">
            <h2>Generated Hashtags:</h2>
            <ul id="hashtags"></ul>
        </div>
    </div>
    <script src="script.js"></script>
</body>
</html>
```

CSS (style.css):
```css
body {
    font-family: Arial, sans-serif;
}

.container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    text-align: center;
}

.input-container {
    margin-bottom: 20px;
}

label {
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    background-color: #3498db;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 3px;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

.output-container {
    display: none;
}

h2 {
    margin-top: 20px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    font-size: 16px;
    margin-bottom: 5px;
}
```

JavaScript (script.js):
```javascript
function generateHashtags() {
    const keyword = document.getElementById("keyword").value;
    const hashtags = generateHashtagsFromKeyword(keyword);
    const hashtagsList = document.getElementById("hashtags");
    hashtagsList.innerHTML = '';

    if (hashtags.length > 0) {
        hashtags.forEach(hashtag => {
            const li = document.createElement("li");
            li.textContent = `#${hashtag}`;
            hashtagsList.appendChild(li);
        });
        document.querySelector(".output-container").style.display = "block";
    } else {
        document.querySelector(".output-container").style.display = "none";
    }
}

function generateHashtagsFromKeyword(keyword) {
    // Add your hashtag generation logic here.
    // This is a simplified example, you can use libraries or APIs for more sophisticated hashtag generation.
    // For simplicity, we'll just split the keyword into words and add '#' to each word.
    const words = keyword.split(' ');
    return words.map(word => word.trim()).filter(Boolean);
}
```

This is a basic example to get you started. In practice, you may want to implement more advanced hashtag generation logic and possibly use external APIs or libraries to suggest relevant hashtags based on the user's input.

HTML Online Editor & Compiler

Write, Run & Share HTML code online using OneCompiler's HTML online Code editor for free. It's one of the robust, feature-rich online Code editor for HTML language, running on the latest version HTML5. Getting started with the OneCompiler's HTML compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as HTML. You can also specify the stylesheet information in styles.css tab and scripts information in scripts.js tab and start coding.

About HTML

HTML(Hyper Text Markup language) is the standard markup language for Web pages, was created by Berners-Lee in the year 1991. Almost every web page over internet might be using HTML.

Syntax help

Fundamentals

  • Any HTML document must start with document declaration <!DOCTYPE html>
  • HTML documents begin with <html> and ends with </html>
  • Headings are defined with <h1> to <h6> where <h1> is the highest important heading and <h6> is the least important sub-heading.
  • Paragrahs are defined in <p>..</p> tag.
  • Links are defined in <a> tag.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>
  • Images are defined in <img> tag, where src attribute consists of image name.
  • Buttons are defined in <button>..</button> tag
  • Lists are defined in <ul> for unordered/bullet list and <ol> for ordered/number list, and the list items are defined in <li>.

HTML Elements and Attributes

  • HTML element is everything present from start tag to end tag.
  • The text present between start and end tag is called HTML element content.
  • Anything can be a tagname but it's preferred to put the meaningful title to the content present as tag name.
  • Do not forget the end tag.
  • Elements with no content are called empty elements.
  • Elements can have attributes which provides additional information about the element.
  • In the below example, href is an attribute and a is the tag name.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>

CSS

CSS(cascading style sheets) describes how HTML elements will look on the web page like color, font-style, font-size, background color etc.

Example:

Below is a sample style sheet which displays heading in green and in Candara font with padding space of 25px.

body{
  padding: 25px;
}
.title {
	color: #228B22;
	font-family: Candara;
}

HTML Tables

  • HTML Tables are defined in <table> tag.
  • Table row should be defined in <tr> tag
  • Table header should be defined in <th> tag
  • Table data should be defined in <td> tag
  • Table caption should be defined in <caption> tag

HTML-Javascript

  • Javascript is used in HTML pages to make them more interactive.
  • <script> is the tag used to write scripts in HTML
  • You can either reference a external script or write script code in this tag.

Example

<script src="script.js"></script>