Markup CityISSUE #12 of 39

comments · notes the browser ignores

Tagg the BuilderVSThe Unclosed Tag

Tagg the Builder saysComments  are notes in your source the browser ignores entirely.

Wrap anything in  and the browser skips it. Use comments to explain tricky markup, leave TODOs, or temporarily disable a chunk without deleting it.

Remember comments are visible to anyone who views source — never put secrets in them. And don't nest comments; the first --> closes the whole thing, which can accidentally re-enable code you meant to hide.

Power-ups you unlock

is ignored by the browser
Great for notes, TODOs, and disabling markup
Visible in view-source — never store secrets
Comments cannot be nested

The Unclosed Tag attacks — common mistakes

Storing API keys or passwords in comments (anyone can read them)
Nesting comments and breaking the close logic
Leaving large commented-out blocks shipping to production

Boss battleComment out the second paragraph so it disappears from the preview, then uncomment it.

Example code

<!doctype html>
<html><head><meta charset="utf-8"></head>
<body>
  <!-- this note never renders -->
  <h1>visible heading</h1>
  <!-- <p>this paragraph is disabled</p> -->
</body></html>

▶ Open the interactive comic issue

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