I'm looking for a way to whitelist fonts that pages in Chrome can use. In Firefox I would just simply disable Allow pages to choose their own fonts, instead of my selections above in content settings but Chrome seems to be keen on letting web designers force ugly and often unreadable fonts on us.
I don't want to use * { font-family: sans; } style in Stylish, because I want to keep sans (or serif) and monospace sections, and web designers, insane as they are, usually keep those at the end of the font-family list.
I've done my research and I still can't figure out how to do it via Chrome extension API.
I considered intercepting requests for CSS files and modifying them in response but this isn't possible via current API.
I could also traverse the DOM tree, inspect CSS on each node and replace it appropriately but it'd expensive. Moreover this wouldn't work for pages which build the content from JavaScript. So I'd have to use MutationObservers and that would be way too expensive.
If I could somehow read CSS files that the current tab is using, I could collect the rules with font-family style and inject appropriate <style> element into the page via content script. But I couldn't find a way to read those CSS file via current API. (I'd also have to read <style> rules embedded in HTML but that's doable).
I could also do it via some proxy but I'm not sure how to (securely) cope with SSL.
I could get close with fontconfig. It gets rid of Arial but doesn't work for external (and usually most ugly) CSS fonts.
Is it possible to achieve my goal via current Chrome extension API? How? If not, what would be the workaround?
I don't care about inline styles and styles set from JavaScript. I can live with those. Vast majority of pages I'm concerned about use styles from external stylesheets.
EDIT
wOxxOm's advice to modify document.styleSheets is the way to do it and I've made a simple extension that worked on all sites! Unfortunately, in current Chrome, CSSStyleSheet#cssRules returns null for stylesheets loaded outside of page origin https://code.google.com/p/chromium/issues/detail?id=45786. T_T
(I'll of course publish the extension on GitHub and post the link here after I polish it).
EDIT 2
As wOxxOm suggested, blocking web fonts is also an option (though less ideal I'd say) and there even exist good open source extension for it https://chrome.google.com/webstore/detail/disable-web-fonts/olmabeadgbpmhllgdkemfdnmkngkbkeg. It needs some white list for iconic fonts though. Local fonts can then be managed via fontconfig.
This issue is probably related to ugly looking web fonts https://code.google.com/p/chromium/issues/detail?id=173207.
EDIT 3
I ended up with this nice (and open source) extension https://chrome.google.com/webstore/detail/font-blocker/knpgaobajhnhgkhhoopjepghknapnikl. It's a blacklist but that's enough for my needs and it works with iconic fonts. As far as I can tell, to implement a font whitelist extension I'd have to be able to enumerate all fonts loaded by a web page and that appears to be impossible in current Chrome (see first edit).
Related
For example, we have a cool styled website, can we use developer options(f12) from browser to snatch this?
Ignoring any legal / copyright implications, you can grab the client-side code this way, yes. All HTML, CSS, JavaScript and imagery can be seen through the F12 Developer Tools.
However, there is no way to know what server-side code a website is using (outside of the server owner themselves configuring something incorrectly and thereby exposing that information).
The answer from Obsidian Age is a good one. I'm going to add some more information that may be useful to you.
I've used this technique myself of getting source code via the developer window. Usually I want to find out how they did some neat CSS or JS trick so that I can try it in my own apps.
The files that make up a website such as HTML, JavaScript, and CSS you can find in the Network tab and can easily copy these.
However you should know the JS, CSS, and even (sometimes to a degree) the HTML files have been minimized and are typically missing any comments from the original developers. Chrome has a nice feature that will un-compress JS files and you can even set break points and step through the JS code.
Opera recently announce their sidebar extensions.
In their boilerplate they load a URL into an iframe, similar to this:
http://julip.co/2010/01/how-to-build-a-chrome-extension-part-3-loading-any-web-page-in-a-popup/
I aim to make a universal wrapper extension for loading other installed extensions to the sidebar and I tried loading a "chrome-extension://" url to the iframe but it didn't work (Got a "This webpage is not available" page instead).
iframe.src = "chrome-extension://ggfngijafepjalmbhefafhdeedobcdbf/popup.html";
I got a feeling its due to security restrictions but does anyone know of other ways to load another extension's popup in another extension's popup?
Or theres no way at all?
Unless the extension specifically allows to load its files in "web_accessible_resources", you can't access them.
Even if you did, you probably break lots of assumptions that extensions have; it's not a good idea.
Can anyone suggest a browser plugin that will let me override a website whenever I am loading a particular website.
Example Scenario:
Whenever I load yahoo.com I want to change on how it renders the html and behave.
It needs to be able to manipulate the DOM. example, it can change the attribute of an <img height="" width="" />, example the width and height of the image.
Aside from changing attributes it also need to be able to inject new elements. example i can insert new <divs> or <p>.
I also need to be able to manipulate the head tag as I like to insert external CSS and JS for the overrides.
I primarily use Google Chrome and Mozilla Firefox.
Thank You.
Chrome has native support and Firefox via a plugin for user scripts (also called greasemonkey scripts). They are essentially javascript files that are installed like an extension. At the top you define the domains for your script to run on and you have access to modify the DOM. There are lots of examples at http://userscripts.org/ . Load a few in chrome and then take a look at the user.js file source to see how they work.
You could also do it via a Bookmarklet, however they are more of a hack compared to Greasemonkey scripts
It's called the content scripts in Chrome extension.
I would like to use Chrome's default favicons.
For example (you can simply open them in Chrome):
chrome://theme/IDR_HISTORY_FAVICON
chrome://theme/IDR_EXTENSIONS_FAVICON
chrome://theme/IDR_SETTINGS_FAVICON
chrome://theme/IDR_PRODUCT_LOGO_16
When I used it as an image source nothing happened. Maybe Chrome blocked the access to the icons or this was not the proper way to use the icons. I tried to use "chrome://favicon/", but it didn't work with Extensions and Settings (strange, but it worked with History).
How can I use the built-in favicons as an image?
I would be also grateful if you could get me a full list of the Chrome's favicons, it must be in Chromium's source code, but I have no idea where to look.
(I'm using Chrome 19.0.1084.52)
I know that Apple products like the iPad or the iPhone have trouble with flash apps.
What web development tools should I use in order to avoid compatibility issues when creating a website? My only constraint is that the languages must provide for interactivity and animation - such as in jQuery.
HTML, CSS, and PHP are a few that I can think of that will behave on 99% of all internet enabled devices.
What tools & languages are available to use when creating a website intended to be viewed on any device's internet "explorer"?
Should I just stick to HTML, CSS, & PHP? I want a certain level of interactivity so that, for example, a user can hover over images and have pop-ups containing data to appear... or when an object is clicked, an action can happen without a page reload.
Can someone point me in the right direction and help me develop a list of languages that are all-device friendly?
I am familiar with programming in several web-focused languages, I'm just wondering which ones to stay away from. Certain ones will limit the devices that can view the site and besides that constraint, the site needs to be interactive and animated.
HTML, CSS, PHP, JQUERY are truly your best bet for developing for a wide range of devices. If the scope of devices is the main goal I would stay away from using HTML5 and CSS3. You still may run into problems using much jquery with IE7 below. Mobile browsers on the other hand are much more advanced or up to date with standards then desktop browsers. I would suggest creating two versions of your application. One dedicated to running on mobile devices and one for desktop browsers. It is a shame apple wouldn't support flash applications. If all you need is hoovers for interaction you won't even need jquery / but for the other it will be useful.
The "Web" is a name for the concept of having interlinked documents accessible over the internet. Therefore, to have a website you really only need a document able to link to other documents, namely HTML.
HTML is not really a programming language or a tool though, it is a document format.
If you want to make a website you need use HTML to Markup what you're writing. Then you use CSS to format different sections of the document you marked up.
PHP though, is completely separate from this, PHP is for creating dynamic HTML, or any document on the server side.
If you want to achieve a flash-effect on a site you use Javascript to modify the page content (HTML) and appearance (CSS).
If you need to learn HTML/CSS I would highly recommend http://htmldog.com/
As per the question, HTML CSS and Javascript are pretty much the only mobile-browser compatible method for website content as they don't need plugins.
What exactly are you trying to do?