In­spect­ing a doc­u­ment

OpenSource For You - - DEVELOPERS INSIGHT -

When the DOM in­spec­tor opens, it may or may not load an as­so­ci­ated doc­u­ment, de­pend­ing on the host ap­pli­ca­tion. If it doesn’t au­to­mat­i­cally load a doc­u­ment or loads a doc­u­ment other than the one you’d like to in­spect, you can se­lect the de­sired doc­u­ment in a few dif­fer­ent ways.

There are three ways of in­spect­ing any doc­u­ment, which are de­scribed be­low.

In­spect­ing con­tent doc­u­ments: The In­spect Con­tent Doc­u­ment menu popup can be ac­cessed from the File menu, and it will list the cur­rently loaded con­tent doc­u­ments. In the Fire­fox and Sea Mon­key browsers, th­ese will be the Web pages you have opened in tabs. For Thun­der­bird and Sea Mon­key Mail and News, any mes­sages you’re view­ing will be listed here.

In­spect­ing Chrome doc­u­ments: The In­spect Chrome Doc­u­ment menu popup can be ac­cessed from the File menu, and it will con­tain the list of cur­rently loaded Chrome win­dows and sub-doc­u­ments. A browser win­dow and the DOM in­spec­tor are likely to al­ready be open and dis­played in this list. The DOM in­spec­tor keeps track of all the win­dows that are open, so to in­spect the DOM of a par­tic­u­lar win­dow in the DOM in­spec­tor, sim­ply ac­cess that win­dow as you would nor­mally do and then choose its ti­tle from this dy­nam­i­cally up­dated menu list.

In­spect­ing ar­bi­trary URLs: We can also in­spect the DOM of ar­bi­trary URLs by us­ing the In­spect a URL menu item in the File menu, or by just en­ter­ing a URL into the DOM in­spec­tor’s ad­dress bar and click­ing In­spect or press­ing En­ter. We should not use this ap­proach to in­spect Chrome doc­u­ments, but in­stead en­sure that the Chrome doc­u­ment loads nor­mally, and use the In­spect Chrome Doc­u­ment menu popup to in­spect the doc­u­ment.

When you in­spect a Web page by this method, a browser pane at the bot­tom of the DOM in­spec­tor win­dow will open up, dis­play­ing the Web page. This al­lows you to use the DOM in­spec­tor with­out hav­ing to use a sep­a­rate browser win­dow, or with­out em­bed­ding a browser in your ap­pli­ca­tion at all. If you find that the browser pane takes up too much space, you may close it, but you will not be able to vis­ually ob­serve any of the con­se­quences of your ac­tions.

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