We supply micro-site content to a client. They supply us with a HTML wrapper and we inject our content into it. I'm trying to debug an issue where our style sheet appears to be interfering with the style in their wrapper.
Normally I'd use firebug or IE Developer Toolbar to select the element and I can see which styles are being applied, which are being overridden and where they are coming from. But this particular problem only exists when I hover the mouse over a link. Specifically, the link shrinks a little bit.
Is there anything that I can use to see what the browser is doing with the styles when I hover the mouse over the link?
Right click on the element. Select 'inspect element'. In the firebug html window click on the tag you're interested in. Hover over the element in page. You should see the style change to e.g a:hover
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I am modifying an existing template to adapt some basic parameters such as colors etc.
I use Google Chrome development extension so I can right click on a particular element use Inspect option to see what CSS rules are being applied to that element.
Then I can override specific rules in my custom CSS file.
So far so good.
My question comes for certain rules, for example if I click on an input element, the border of that element changes color but I can not right click and inspect as the focus is lost and hence I can not see in Google Developer tools what rules are being applied to that element when the focus is in that element.
Which is the strategy to debug such cases?
You can right click on the element in the Chrome Inspector and there is a 'Force state...' context menu item.
Here is a video clip demonstrating how to do it. https://developers.google.com/web/updates/2015/05/triggering-of-pseudo-classes
I've inherited an .asp website and had to update the pages to relocate forms in tables to the sidebar.
It's worked fine on all but one page which stubbornly refuses to accept my css and is taking values from who knows where.
I've tried debugging in Firefox/Chrome and even written rules in the head of the page but to no avail. Is there a tool for identifying this kind of thing? I'm no slouch with css but this is baffling me. I don't want to resort to javascript to fix this as I see it as a fundamental issue.
Is there a way to find out where a css rule is coming from?
You may use web inspector in Chrome.
Right click on failing element and select inspect element.
You should end up with web inspector window with two sections: left is html nodes tree and right is styles and properties of selected node. Failing element should be selected already.
Next you need to expand "Computed Style" tab and look for offending style.
When found, you'll see small triangle to the left of style definition - it is clickable. On click it should expand list of selectors that affects this style for this element. You'll see url to css for each of this. Bingo.
As pointed out by austin and Waterlink the Computed styles (or Computed in FF) tab can show the currently applied styles, and their origin.
However, the Styles tab is also very useful. Upon right-clicking "inspect" on an element, the Styles tab will show a Full list of all the active styles and overwritten styles related to the inspected element. (Shows them as they were written in the CSS. Not what is actually being rendered)
That way you can tell which styles were overwritten in which order. A style in your css could be overwritten from an inline style, user defined style, a later defined css file or a css rule of higher importance, or even a non-css-attribute such as width/height attributes directly on a HTML-element
The formatting shows the status for a style:
normal text = active
strike through = inactive since another style has overwritten it
greyed out = identifier not applied. ( If you are inspecting the Style of a <p> element and the css identifier is p, span , then the span identifer would be greyed out)
Example:
In this image, the color property of #post a is inactive. It has been overwritten by the color property in #cashieCatalog.
In the HTML tab of Firebug, you should see a panel on the right with tabs Style, Computed, Layout, and DOM. Select Computed. This will show you the "current" style being applied to the page.
If you expand a rule node, you should see a link on the right showing you which style sheet it is coming from, along with stylesheet rules that are being overridden.
I'm using Google Chrome Developer Kit, I have a button with some CSS style applied, I need to see the properties associated on this status Hover in Googel Chrome Devoper windows.
How to do it? When I move out from the button change status and I cannot see the CSS applied.
Thanks for your time!
When you inspect element, there are a couple of icons top right ...
Click the one as in the image (pointer) and select the states for your element with the checkboxes.
I have a site where the background-image jumps up on hover state and I can't for the life of me find the specific css that does this.
I'm able to get to the "offending" link and give it a border and change the padding and margin. The problem is that firebug and chrome inspect does not show me what happens on the hover state.
So I want a way to see what additions to the normal css state happens on :hover.
Any pointers?
(P.S. IE 8 doesn't have this issue - ie no jumping of background image)
Try using the Inspect function in FireBug to focus in on the element in question. It will show you all related CSS, including any CSS that is related to :hover. You can also see in this way what changes happen to the elements CSS (and any other DOM attribute) when you hover your mouse.
In case the changes are coming from some JavaScript, try out the Visual Event bookmarklet. Activating it on the page will let you see all events that are tied to the element in question.
I want to debug the CSS for a DHTML menu, but the element I want to debug is a submenu, so it only appears when the top element in the menu is clicked.
So I can't use that button on Firebug that shows the CSS for the next element clicked, because when I click on the top menu item it will show the CSS for that element, not its child, and if I expand the menu first and then click on the Firebug button the submenu disappears (it disappears when it loses focus).
Any tips on how to get out of this catch-22?
Use firebug console command line to run click event. Like $('#menutab a').click(); If it's needed, you could also set breakpoint to avoid hidding.
Read more in firebug documentation
Select your element in the HTML tab, directly in the source.
Then, you can hover your page to toggle it.
In cases like this I sometimes alter the script slightly in order for the 'hidden' element to stay visible.
In this case, I would perhaps comment out/disable the script code which hides the element on blur. That way you can click the main element, and inspect the now visible item for as long as needed.
What about debuging with all the buttons visible? Or you can still find the elemnt in the HTML tree.
In Opera, you can use Dragonfly (Tools > Advanced > Developer Tools, or Ctrl+Shift+i) to solve this issue. When the tools are active, clicking on any part of the page will navigate to that section of the HTML side-by-side with its CSS.