Expanding Images using HTML5′s contenteditable tabindex
HTML5 has a new attribute, contenteditable, which can be applied to any element which allows it to be edited directly in the browser window. Think of text input with a predefined value, but it can literally be any element. Form elements like text inputs support the :focus pseudo class, which allow us to style those elements when they are clicked upon or otherwise navigated to. Giving an element the contenteditable attribute means it also now supports the :focus pseudo class, which opens up some interesting possibilities!
We’ll exploit this little trick to make an expanding image (like a lightbox without the overlay) right within some content.
UPDATE: Even better, you can give attributes a tabindex attribute, like you would a form element, which allow allows :focus without the editability. This article has been updated to go that route instead.
HTML5 has nice elements for including captioned images.
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We just give the figure element tabindex, so that it can be in focus.
Give each subsequent figure a tabindex value one higher and the images will be able to be tabbed through nicely from the keyboard! The Images
The images will be “full size”.
This means they will be scaled down for regular display on the page, and scaled up when we do our magical CSS expanding. Potentially a waste of bandwidth for the browsers that don’t support this. The tradeoff is your call.
The :focus part of this isn’t CSS3, the but shadows, transforms, and transitions are. The hover state will rotate the image a bit, and the :focus style (when the image is clicked on), will expand it, rotate it again, and make sure it’s on top with z-index.
The HTML5 contenteditable attribute is supported in Firefox 3.6+, Safari 4+, Chrome, and Opera (10.6 only tested). Note that the attribute will cascade down to all child elements. In our demo, having the image and figure caption be editable doesn’t make much sense, so we can turn it off individually on them.
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Opera respects the child elements not being editable, but still runs the spellchecker on them and will red-underline words it finds misspelled which can be a bit weird.
Our demo also relies upon transforms to “work” though, which are only supported in current WebKit browsers and Firefox 4+. Firefox 3.6 supports the transform but not the transition.
The fallback is that the images just don’t expand though, which is of course no big deal.
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