These bookmarklets let you see how a web page is coded without digging through the source, debug problems in web pages quickly, and experiment with CSS or JS without editing the actual page.

Bookmarklet Description Works in
jsenv Opens a JavaScript Development Environment and allows it to access the current page.
test styles Type in CSS rules to experiment or to create a temporary user style sheet.
edit styles Experiment with changes to the page's style sheet.
ancestors Lists the ancestors of any element you hover over in the status bar.
computed styles Lists the computed styles of an element and of its ancestors.
zap style sheets Disables all style sheets.
zap presentational html Removes most presentational attributes and tags while leaving style sheets intact.
view style sheets Displays linked and embedded style sheets.
view scripts Displays linked and embedded scripts.
view variables Displays all JavaScript variables and functions.
list classes Lists classes used in the document.
generated source Displays the current DOM tree of the page as HTML.
partial source Displays the current DOM tree of the selection as HTML.
serialize as xml Displays the current DOM tree of the page as XML.
show blocks Draws borders to show tables (colors indicate nesting), paragraphs, and divs.
topographic view Shows the nesting level of every element using shading.
topo with borders Shows the nesting level of every element using shading and 3D borders.
make link Creates the HTML code to link to the current page.
make img tag Creates the XHTML code to include the current image.
named anchors Makes anchors visible, letting you link to or bookmark a section of a page.
onerror status When a JavaScript error occurs, shows the error message in the status bar.
onerror alert When a JavaScript error occurs, shows the error message in a dialog.


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