Adding Developer Comments to HTML Source Code
Jul 09, 2025 am 12:29 AM
Adding comments in HTML can improve code readability and team collaboration efficiency. Because HTML is a structured markup language, lacks obvious logical processes, and it is difficult to understand the role of blocks when the page is complex. At this time, the comments can be used as "navigation" to answer questions such as module purpose, dynamic content source, form behavior, etc. Effective comments should be clear and concise, and use the syntax of the . Common methods include explaining the purpose of the module (such as ), marking the boundaries of the code segments, and avoiding redundant explanations. Scenes suitable for annotation include page structure partitions, complex nesting areas, elements that require special processing and template reference locations. The unified annotation style is better when collaborating with teams, such as whether to use abbreviations, alignment, specific keywords, etc., which will help maintain and understand for a long time.
Adding developer comments to HTML source code is a good habit to improve code readability and team collaboration efficiency. Although these comments won't be displayed in the browser, they can help you or others quickly understand the code structure and functional intent.
Why comment in HTML?
HTML itself is a structured markup language, but it doesn't have obvious logical flows like JavaScript or CSS. When the page becomes larger and the structure becomes complex, it may be difficult to immediately understand the role of a certain block just by looking at the tags. At this time, adding a few short comments can play the role of "navigation".
for example:
- What does this
<div> do?<li> Is this content dynamically generated?</li> <li> Where will this form jump after submitting?</li> <p> These questions can be answered through comments to reduce the time cost of reading the code. </p> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175199215797777.jpeg" class="lazy" alt="Adding Developer Comments to HTML Source Code"><h3 id="How-to-write-valid-HTML-comments"> How to write valid HTML comments?</h3> <p> The syntax of HTML comments is very simple: just wrap it with <code><!-- 注釋內(nèi)容-->. The key is to write it usefully, clearly, and not overstatement.Here are some practical suggestions:
Explain the use of the module
For example:<!-- 導(dǎo)航欄開始--> ... <!-- 導(dǎo)航欄結(jié)束-->, so that others can know what this part does at a glance.Notes or to-do items
For example:<!-- TODO: 替換為動(dòng)態(tài)菜單-->or<!-- 注意：此處依賴外部樣式-->Indicate the boundary of the code segment
If a part of the structure is very long, you can add comments at the beginning and end to facilitate folding and viewing.Avoid redundant explanations
There is no need to comment on each tag, such as<p>段落</p>so there is no need to write "This is a paragraph".
Which places are suitable for commenting?
Not all places require comments, but adding comments in the following scenarios can be helpful:
- Where the page structure is clearly separated (such as the head, sidebar, bottom)
- Areas containing complex nested structures
- Elements that require special processing (such as SEO-related meta tags, third-party script insertion points)
- Reference location for templates or components
For example:
<!-- Main content area--> <main class="content"> <article> ... </article> </main> <!-- /Main Content Area-->This kind of writing is very common in large-scale projects, especially when multiple people develop in collaboration.
The comment style can be unified and better
If you are writing a project alone, you can do whatever you want; but if you are in a team, it is best to unify the annotation style. for example:
- Whether to use abbreviation (such as
<!-- END nav -->or write in full<!-- 結(jié)束導(dǎo)航欄-->) - Is the comments aligned
- Whether to use specific keywords (such as TODO, FIXME)
Some teams will also cooperate with the construction tool to automatically check the annotation specifications, but this is an advanced gameplay.
Basically that's it. Comments are a small detail, but using them well can make the code easier to maintain and it is not easy to wrap yourself in.
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