[RFE] Full zoom for content (objects as well as text)




18 years ago
16 years ago


(Reporter: Brian 'netdragon' Bober, Assigned: karnaze (gone))




Firefox Tracking Flags

(Not tracked)


(Whiteboard: [parity-opera])



18 years ago
you should be able to zoom in and out of a page. I have known many times this 
would come in handy.

Comment 1

18 years ago
This is an enhancement.
The amount of reworking of the browser internals that this would require would 
be enormous! If we want Mozilla this side of the Millennium, I'm afraid you are 
going to be disappointed :-( There are options to change font size already. Are 
you having trouble reading small text? There's bugs on this, as well.

Last Resolved: 18 years ago

Comment 3

18 years ago
what is this resolved as?  I'm not seeing anything in the Resolution field .is
this jsut a moz bug :)

Comment 4

18 years ago
Actually, it is for pages that have a lot of text or pictures horizontally and 
vertically or big text and I would like to see more of the page. Or for looking 
at a really big picture. I would rather not download it and use paint shop pro 
or adobe photoshop.

Comment 5

18 years ago
Please reopen if you feel this would be good. 

Comment 6

18 years ago
I can't resolve because I have had my ability to resolve removed. 

Comment 7

18 years ago
Verifying unknown resolution to see what it is (I hope)

Comment 8

18 years ago
I have no idea what the resolution is (How weird) :)
Anyway changing summary...

If this was persued, Mozilla would be the first browser with ability to zoom.
Summary: Zooming → [RFE] Zooming within Mozilla Browser

Comment 9

18 years ago
Actually, I don't think it has a resolution at all. Bug within bugzilla?

Comment 10

18 years ago
Going to go on the newsgroup and see what people think about my new ideas. Do 
whatever you like with this bug.
Summary: [RFE] Zooming within Mozilla Browser → [RFE] ZOOMING within Mozilla Browser

Comment 11

18 years ago
boberb@rpi.edu: Mozilla wouldn't be the first browser with a zoom feature -
Opera has it.  Try it yourself, there's a free evaluation available at

I'm reopening since I agree that this would be a great feature - even more so if
Mozilla could resize images more smoothly than eg. Opera.  (Yeah, I know it's
extremely CPU-consuming to resample images on the fly. Maybe for Mozilla 3.0?


18 years ago
Ever confirmed: true

Comment 12

18 years ago
asadotzler@netscape.net (Asa Dotzler) taking ownership of Browser General bugs. 
 New QA Contact is jelwell@singleclick.com (Joseph Elwell).  Sorry for the spam.
Assignee: cbegle → asadotzler
QA Contact: asadotzler → jelwell

Comment 13

18 years ago
adding helpwanted keyword and reassigning to nobody@mozilla.org
Assignee: asadotzler → nobody
Keywords: helpwanted

Comment 14

17 years ago
Ie 5.5 have supported with Zoom. You can see big picture from zoom. It's new 
feature of IE 5.5. It would added this feature in Mozillia.

feature Zoom would be suitable for image Gif, jpg and bmp.

Comment 15

17 years ago
Sorry for the spam.  New QA Contact for Browser General.  Thanks for your help
Joseph (good luck with the new job) and welcome aboard Doron Rosenberg
QA Contact: jelwell → doronr

Comment 16

17 years ago
In case you are confused, I meant a zoom like in word processors where you can 
scale the size of the document. It is still functional, just zoomed. I didn't 
mean, though, zooming individual images - I meant the whole page. All you have 
to do is multiply mouse clicks against 1/zoom_factor to see where they clicked 
and to display, you just send the full size document through a filter that 
resizs it. This would resize controls, text, and images.

Comment 17

17 years ago
That's exactly what Opera's zoom is doing.  Very cool feature.
(Changing Platform/OS to All/All, by the way.)
OS: other → All
Hardware: Other → All

Comment 18

17 years ago
See also bug 46996: [RFE] XUL Lense 
reporter - do you agree this is a dupe of an bug with the correct developers
assigned to it?

Comment 20

17 years ago
No, I meant zooming like in Adobe Acrobat or Microsoft Word. Zooming within the 
whole window.

Comment 21

17 years ago
ie5.5 added print preview, a feature that netscape has had for years.

Assuming mozilla had print preview (I think it does/will) and can zoom, would 
you be satisfied?
print preview is going to be in it, don't worry ;)
20943 is the print preview hook-up bug, currently nsbeta3-

Comment 24

17 years ago
> Assuming mozilla had print preview (I think it does/will) and can zoom, would 
> you be satisfied?

No.  It'd be like claiming that because Word has print preview, it doesn't need 
zoom in document editing mode.  Print preview and "browsing zoom" are needed for 
two different purposes.

Adding '4xp' keyword since Opera has had this feature for years.
Keywords: 4xp

Comment 25

17 years ago
Removing 4xp. That's an abuse. Please use status whiteboard instead.
Keywords: 4xp
Whiteboard: [parity-opera]

Comment 26

17 years ago
From http://bugzilla.mozilla.org/describekeywords.cgi :
  "A bug is a Product Parity bug if it occurs on Mozilla builds, but does not
  occur using the latest release of Netscape Communicator 4.x or competitor

I guess you refuse to count Opera as a competitor? :-)

That being said, the definition can be interpreted so that _no_ competitor 
product may have the bug (or in this case, a missing feature) in order for the 
bug to qualify as 4xp.  I understood that a bug is 4xp if there's one or more 
competitor product that doesn't have the bug - effectively giving "4xp" the 
meaning "somebody's ahead of us here!".

Please tell me I was wrong, and I'll file a bug on Bugzilla requesting a more 
precise definition for the keyword.

Comment 27

17 years ago
Howdy timeless. Thank you for supporting this bug, Antti. I think taking a 
roundabout approach to zoom (ie - enlarging images/text) would not add as much 
to the functionality of Mozilla. I can tell you, if Microsoft Word, or Corel 
Wordperfect came without zoom - I would cry! Seriously, the enlarging text is a 
bad feature all in itself because it can really mess up some web pages' layout. 
I think Zoom would be a much better feature for someone with disabilities. I 
even think that if Zoom existed, you could remove the annoying enlarge text. 
BTW - Do you think people want someone going to a web page they worked hard on 
and enlarging my text? Even www.w3c.org talks about zooming in the CSS 
documentation. It said it wouldn't include zooming in the CSS definition - that 
is for user agents to do. 

I do not have any idea how this would be implemented - but someone must. It 
would probably require making a zoom class and going through the all interface 
code and multiplying dimensions by the zoom percentage. 

Does anyone have the guts/time to undertake this? 

Comment 28

17 years ago

18.5 Magnification 
The CSS working group considers that the magnification of a document or portions 
of a document should not be specified through style sheets. User agents may 
support such magnification in different ways (e.g., larger images, louder 
sounds, etc.) When magnifying a page, UAs should preserve the relationships 
between positioned elements. For example, a comic strip may be composed of 
images with overlaid text elements. When magnifying this page, a user agent 
should keep the text within the comic strip balloon.


Comment 29

17 years ago
Bleh. It should be noted that the useragent should have some flexibility.
If you make a 16x16pixel picture and force the useragent to render text in 
that, then it's your fault for constraining the text.  The useragent should be 
helping the user experience the site. Zooming is actually a future feature, 
text sizing is a now feature (see mpt/jag comments on the sizing bugs).

If someone wants to make a page that isn't obfuscatable by a useragent, they 
should use PDF, PostScript or JPG/PNG.

Also that reference is useless, it says CSS2 will not govern sizing, nor future 
CSS.  cc: hixie, mpt.

fwiw, in a recent version of wordperfect, print preview is not readonly, it is 
just another view. Word might make a distinction.

Comment 30

17 years ago
So much talk, so little implementation ...

To start with, this is a -->Layout issue. The layout engine, given a zoom level, 
needs to render the document such that:
* text is rendered at the desired zoom level
* objects (such as images) are rendered at the desired zoom level, but *only* if
  the zoom level is outside a certain (minimum,maximum) range which would be set
  in preferences (see <http://style.metrius.com/cssui/#docu> for explanation).

Once that is done, two dependee bugs can be filed: one to add minimum and maximum 
prefs to the prefs dialog, and one to change the `View' > `Text Size' submenu to 
a `View' > `Zoom' submenu.
Assignee: nobody → clayton
Component: Browser-General → Layout
Depends on: 37940
QA Contact: doronr → petersen
Summary: [RFE] ZOOMING within Mozilla Browser → [RFE] Full zoom for content (objects as well as text)

Comment 31

17 years ago
>> So much talk, so little implementation ...

I agree Mathew. I'm glad someone is finally doing something with this. I would 
do it myself if I knew how / had the time.
Dividing up Claytons bugs to triage
Assignee: clayton → rods


17 years ago
Target Milestone: --- → Future

Comment 33

17 years ago
marking future

Comment 34

17 years ago
This is a new message I posted in the Newsgroup:


I think there should be a zoom in Mozilla. This zoom should be similiar to
that which you see on word processors, and adobe acrobat. It should zoom
text and objects by exactly the same scale. There should be a min zoom of
maybe 20% and a max zoom of maybe 500%. Any zoom within this range should be
allowed by entering it in a special dialog box - selectable from the
View->Zoom menu, or several predefined values on the menu can be selected.
You can set an option in preferences to decide whether zoom values are kept
when you go to a new page or not. I don't believe text or objects should be
independently zoomed, because that affects the way the page looks - to the
dismay of the page author. Therefore, I think zoom should be added, and the
scale text be removed.

I do not believe that there has to be a device independent unit of measure
for zoom, as it is expected that someone with a very large, high res monitor
should see more of the page than someone with a low res, small monitor.

There is already a standard way to define text in terms of pixels.

If it is zoomed out too much to read the text, then that is not a problem.

I have heard that Opera and Internet Explorer both have a zoom feature.

Comment 35

17 years ago
This is how I believe zoom could be added to Mozilla. Firstly, you go through 
EVERY object, including buttons, text boxes, etc, and give them an ability to 
internally scale. You can do this without even disrupting any builds. You can 
then test it with the attribute zoompct - ie <textarea zoompct="50%">. This 
attribute would be removed when Mozilla was released. Then, one by one, you 
could test the zooming abilities of each object. Text boxes, etc could be 
zoomed by multiplying the width of the border * zoompct, the scrollbar width by 
zoompct (the scrollbar is another object), the scrollbar height * zoompct, and 
use the equation to convert pixels to points to convert zoompct to points, then 
multiply it times the text points inside the text box. You can then test each 
object's zooming ability alone. 

Then, you could use that same text zooming tecnique on the text in the 

Images are really easy to zoom. Most operating systems even have APIs to do it 
for you - or you could use a filter.

After that, its time to put the tests into practice - you just multiply each 
object's top, bottom, left and right boundaries times zoompct before they are 
placed on the page, text would also be postitioned using the same technique, 
and viola! You have a zoomed document. You can even set lower and upper zoom 
limits based on what works and what doesn't. 

I think the zoom feature is really important. Disabled people should have the 
ability to view a document the same way we do without it becoming distorted by 
overflowing text. Its not always the designers fault someone can't see a 
document - besides being disabled, someone might have a really small monitor, 
or a very high resolution. When all designers move to CSS, overflowing text 
will probably be cut off. The text enlargement feature is no replacement for a 
zoom feature. It doesn't even zoom images. Text isn't always the only thing 
that needs to be enlarged. 

Comment 36

17 years ago
I do not think this bug should depend on 37940, as that bug is about 
resizing text size - while this is zooming full content. Can we remove that as a 

The hope is that when actual zooming is added, text resizing will be obsolete 
and rarely needed. As there will be some page that a joker makes with 2pt font, 
text resizing will still be needed, but it has the ability to mangle people's 
pages - so hopefully people will use zoom more often instead.

Comment 37

17 years ago
reassigning to core layout
Assignee: rods → karnaze
I see a fairly intensive implementation mentioned.  Is it possible there's a
simpler solution, such as at the GFX layer?  (Plus maybe work with things that
may bypass it, like GTK widgets/etc).

If we could get some others involved (especially people who know "how it should
be implemented" and can write it down), we can put some resources into

This would be a big win for accessibility.


Comment 39

17 years ago
Marc Attinasi has some great ideas on how to proceed:

1) Make nsPresShell::GetScaledPixelsToTwips, GetPixelsToTwips, GetTwipsToPixels 
understand a zoom factor
2) Call nsPresShell::ReconstructFrames to reframe the entire document with the 
new zoom factor

Images that don't have a width or height set will have to be dealt with. Look in 
We're not sure if the conversion routines for pixels to/from twips will handle 
all of the fonts or not.
If the viewport width needs to be affected then there are some to deal with. I 
would hope this is not the case.

Comment 40

17 years ago
I have tested the solution proposed by Marc Attinasi and I think it's the right 
way to do handle the problem.  There are still a lot of problems (images, 
fonts, size of scrollbars, size of the page...) but I will post some patches in 
about 2 weeks and ask for help/advise to finish the work
Cc'ing image buddies.


Comment 42

17 years ago
i also think this is a great idea, especially since it directly helps my own
project ;). In the case where we need to create thumbnails of a page (for UI
hacking, as in my case i'm creating a history UI which will use thumbnails) and
don't want the top 16x16 pixels, but the entire page scaled.

Comment 43

17 years ago
*** Bug 72985 has been marked as a duplicate of this bug. ***

Comment 44

17 years ago
See also bug 73322, auto-resizing images to fit within the window.

Comment 45

17 years ago
Would someone please take this bug.  

*** This bug has been marked as a duplicate of 4821 ***
Last Resolved: 18 years ago17 years ago
Resolution: --- → DUPLICATE

Comment 47

17 years ago
vrfy dupe
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