Tools / CSS Selector Tester

CSS Selector Tester

Test CSS selectors live against your HTML. Real DOM queries, matches highlighted in preview, specificity calculator, common selector reference. 100% browser-based, no signup, no upload.

Private Runs 100% in your browser — no external DOM, no upload
HTML Source
0 lines 0 chars Ready
$
Enter a selector
Try:
Matches 0
Matches will appear here.
Live Preview Matched elements highlighted
CSS Selector Reference Common patterns you can test above
Basic
divElement
.classClass
#idID
*Universal
a, bGroup
Combinators
div pDescendant
div > pChild
h1 + pAdjacent sibling
h1 ~ pGeneral sibling
Attribute
[href]Has attribute
[type="text"]Equals
[href^="https"]Starts with
[href$=".pdf"]Ends with
[class*="btn"]Contains
Pseudo-classes
:first-childFirst child
:last-childLast child
:nth-child(2)Nth child
:nth-child(odd)Odd children
:not(.x)Negation
:hoverHover (live)
:checkedChecked inputs
Pseudo-elements
::beforeBefore content
::afterAfter content
::first-lineFirst line
::selectionSelected text
Specificity
element0,0,1
.class0,1,0
#id1,0,0
style=""1,0,0,0
!importantoverrides
Runs 100% in your browser. Your HTML and selectors never leave your device.
Tip: ::before, ::after, and ::first-line are pseudo-elements — they cannot be matched by querySelectorAll(). If a selector returns 0 matches but looks correct, it may be a pseudo-element. Try the pseudo-class version instead (e.g., :first-child).

What is the CSS Selector Tester?

Test CSS selectors live against your HTML. Real DOM queries, matches highlighted in preview, specificity calculator, common selector reference. 100% browser-based, no signup, no upload.

It runs 100% in your browser — your files never leave your device, no signup is required, and there are no usage limits or watermarks.

How to Use the CSS Selector Tester

  1. Paste, drop, or type your input into the tool above.
  2. Adjust the options to match what you need.
  3. Preview the result before copying or downloading.
  4. Everything is generated on your device — nothing is uploaded.

Why Use Our CSS Selector Tester?

  • 100% private — files never leave your device.
  • No signup, no email, no limits — completely free.
  • Works on any device — desktop, tablet, mobile.
  • No watermarks, no hidden fees.

Frequently Asked Questions

Is the CSS Selector Tester free?

Yes — completely free with no signup, no email, and no usage limits.

Are my files uploaded to a server?

No. Everything runs in your browser using JavaScript. Your files never leave your device.

Do I need to install anything?

No — just open this page in any modern browser (Chrome, Firefox, Safari, Edge).

Does the CSS Selector Tester work on mobile?

Yes, on iOS and Android browsers. Very large files are best handled on desktop.

Is there a file size limit?

No hard limits. Files under 100 MB work well on most devices.

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