Hypertext Mark-up Language
Hypertext Mark-up Language, commonly known as HTML, is the standard mark-up language used for creating documents meant for viewing on web browsers. It defines the structure and content of web content. Tools such as Cascading Style Sheets (CSS) and scripting languages like JavaScript are often utilized in conjunction with HTML to enhance the presentation and functionality of web pages.
Upon receiving HTML documents from a web server or local storage, web browsers convert them into interactive web pages with multimedia elements. Initially, HTML included indicators for designing a page and offered a meaningful portrayal of the page's layout.
HTML elements are the foundational components of an HTML document. By utilizing HTML structures, it is possible to insert images, interactive forms, and various other elements into the resulting webpage.
HTML provides a method to create organized content by defining structural meanings for various text components such as headings, paragraphs, lists, links, quotes, and more. Tags enclosed in angle brackets are utilized to differentiate HTML elements.
Content is introduced into the page directly by tags like <img> and <input>. Sub-element tags may be included in other tags like <p> and </p>, which enclose and offer information about the document text. The HTML tags are used by browsers to read the content of the page, but they are not displayed.
Scripting languages such as JavaScript enable the integration of programs into HTML pages, allowing for the alteration of their content and functionality. The styling and structuring of content are determined through the utilization of CSS.
The World Wide Web Consortium (W3C) has advocated for the adoption of CSS over explicit presentational HTML since 1997. While previously responsible for overseeing the HTML standard, W3C now oversees the CSS standards. In HTML5, a variation of HTML, JavaScript and the <video> element are key tools for displaying audio and video content.
HTML Comments
HTML comments are typically disregarded by browsers, making it convenient for developers to annotate their HTML code for improved readability. Comments are also useful for debugging by temporarily excluding certain elements in the code.
HTML Comments: What Are They?
HTML comments are annotations or notes added to HTML code that remain invisible to the user in a browser. They serve a similar purpose as comments in other programming languages by providing developers with explanations, reminders, or instructions when collaborating on a project.
Comments in HTML are useful for providing additional information on a webpage without altering its appearance, as web browsers do not show them during page rendering.
During the development process, it is beneficial to utilize comments within the code to keep track of progress. These notes can serve as reminders for yourself or other developers regarding the purpose of specific code sections, tasks to be completed, or errors that need attention. In essence, incorporating comments in HTML facilitates smoother website development and debugging processes.
How to Compose an HTML Comment
Place a <! --tag before the tag and ----> marker following the code that needs to be concealed for annotation in HTML. Web browsers are directed to ignore any content enclosed within these markers. For instance, envision a scenario where you are collaborating with a team of programmers on a website project. It is essential to communicate to them the importance of maintaining uniform button colors throughout the site.
When to Use Comments in HTML
HTML comments are not visible in web browsers. This means that any comments included in the HTML source code will not be displayed when the document is viewed in a browser.
It's worth noting that almost every website available online allows anyone to view its source code by navigating to View -> Developer -> View Source; this includes comments as well!
Consequently, when sharing HTML content publicly and allowing others to view the source code, their remarks will be visible to everyone.
In software development, adhering to best practices and incorporating comments into your code is highly recommended. Comments play a crucial role in enhancing documentation and facilitating communication regarding the codebase and the underlying thought process. Furthermore, when revisiting a project after an extended period, comments serve as valuable cues, refreshing your memory on past decisions and actions.
Additionally, comments play a crucial role in enabling effective communication among the developers collaborating on a project. They provide clarity on the purpose behind certain lines of code, allowing others to grasp your intentions more easily.
Single-line comments in HTML
Single-line comments are utilized when a comment is confined to just one line, where the data is present within that single line.
Syntax:
<!--The comment is written here -->
Example
<!DOCTYPE html>
<html>
<body>
<!--This is heading Tag-->
<h1>Example Site</h1>
<!?Here we are going to see the single-line comment-->
<h2>This is <!--given for--> single line comment</h2>
</body>
</html>
Multiline comments in HTML:
Multi-line comments are an extension of single-line comments that allow for comments spanning multiple lines in code. In HTML, it is possible to comment on multiple lines simultaneously, making it convenient for providing detailed descriptions or commenting out blocks of code for debugging purposes.
Html:
<!DOCTYPE html>
<html>
<body>
<!-- This is heading tag -->
<h1>Example Site</h1>
<!?Here we have
a multi-line
comment -->
<h2>Here we are going to see the multiline comments</h2>
<!-- <button style="font-family: Sans-serif;"> Click Me </button> -->
</body>
</html>
The following code demonstrates how to utilize multi-line comments in HTML. These comments are not visible on the webpage but are beneficial for comprehending the HTML code. In the provided code snippet, single-line comments are employed to annotate data that spans across multiple lines, aiding in clarifying the code's purpose.
Example:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<p>This <!--apple --> is very tasty</p>
</body>
</html>
How to In HTML Comment out a Tag
How can you eliminate a tag from an HTML document?
The selected tag in <-- --> is surrounded in a circle like this:
!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h2> portfolio page</h2>
<h3>Certification projects</h3>
<!-- <section class="Topper">
</section> -->
<h2>High scorer</h2>
</body>
</html>
Improving the debugging process can be achieved by commenting out tags. When encountering any issues or unexpected behavior, it is advisable to selectively comment out individual tags to isolate the problem. By doing so, you can systematically test and pinpoint the problematic tags.
Shortcut on the Keyboard for Adding HTML Comments
Comments can be easily added using shortcuts, which are commonly used by developers. On Mac systems, the shortcut for adding comments is Command /, while Windows and Linux users can use Control /.
To create a single-line comment in the code editor, press and hold the specified keys. This action will comment out the entire line you are currently on. Please note that this method is only applicable to single-line comments, as it will comment out everything on that line, requiring you to insert inline comments manually.
To create multi-line comments, press and hold the specified keys mentioned earlier. Begin by selecting and marking all the desired text or tags for commenting. Subsequently, each selected line will be converted into a comment.
Conclusion:
Interacting with fellow developers within your code is facilitated by HTML comments. Collaborating effectively on a web development project is best achieved through the utilization of HTML comments. Additionally, HTML comments can function as reminders for future modifications that need to be made.
Utilizing comments is a valuable method for establishing thorough documentation in an HTML project since they are solely visible in the source code and do not appear on the actual page. Including comments in your web project is widely regarded as a beneficial approach by numerous developers.