In Firefox, theres a Extension called “Html Validator”. It adds a little indicator icon at the bottom right corner of your window. When a page you visit isnt valid, it lights up. You can click on it to see the errors. The really important feature of this extension is that it does not make a connection to w3cs validator. The same validating SGML parser used by w3c is bundled. This means, it validate any local html files. (this is most important use for me, as i do web dev with manually coded html files. Each time i preview my html in browser, i can also know whether it has html errors.)
Is there anything similar in Google Chrome, Opera, Safari, or even IE9? As far as i checked in the past years, all other validator ive seen simply send the current url to w3cs validator site.
I dont think that type of thing is usually built in, because they arent needed by the average user and can slow down your browsing. Generally speaking, add-ons are the way to go, in my humble opinion.
The top two browser additions for anyone who is developing any website are: Firebug (as mentioned by a previous response) and the Web Developer toolbar, available for many browsers. Here is a link to the developers page for the toolbar: Website for Web Developer Toolbar
The HTML Tidy Browser Extension works quite well, although it doesnt have as many features as the Firefox counterpart. As an added bonus, it works on localhost pages. You can get it here: https://chrome.google.com/webstore/detail/html-tidy-browser-extensi/gljdonhfjnfdklljmfaabfpjlonflfnm
HTML Validator by Robert Nyman for Google Chrome has an indicator icon, displays inline results, and validates local files.
Every browser have an HTML validator. If you re using Mozilla Firefox, then you can install a plugin called "Fire bug", through which you could see the ajax and jquery calls to server. its missing in many of other broswers....
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