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In the past people used to wrap HTML comment tags around blocks of JavaScript in order to prevent "older" browsers from displaying the script. Even Lynx is smart enough to ignore JavaScript, so why do some people keep doing this? Are there any valid reasons these days?
<script type="text/javascript"> <!-- //some js code //--> </script> Edit: There is ONE situation I did encounter. Some code editors, such as Dreamweaver, get confused by quoted HTML inside a JavaScript string when in "design view" and try to display it as part of your page.
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JavaScript comments can be used to explain JavaScript code, and to make it more readable. JavaScript comments can also be used to prevent execution, when testing alternative code.
What are the negatives of HTML comments? worsens the UX - even not visible, the HTML comments are part of the DOM tree and increase the number of DOM elements. This, in turn, affects the quickness and responsiveness, also leads to slower CSS selectors and DOM manipulation.
It is a good practice to add comments into your HTML code, especially in complex documents, to indicate sections of a document, and any other notes to anyone looking at the code. Comments help you and others understand your code and increases code readability.
In HTML, a comment is text enclosed within < ! ╌ ╌> tags. This syntax tells the browser that they are comments and should not be rendered on the front end. Thanks to the comments tag, you can leave notes to remind yourself where you left off in the build process.
No, absolutely not. Any user agent, search engine spider, or absolutely anything else these days is smart enough to ignore Javascript if it can't execute it.
There was only a very brief period when this was at all helpful, and it was around 1996.
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