eww: Advanced
3 Advanced
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You can view the source of a website with ‘v’ (‘eww-view-source’). This
will open a new buffer ‘*eww-source*’ and insert the source. The buffer
will be set to ‘html-mode’ if available.
EWW handles cookies through the 
url package (url)Top. You can
list existing cookies with ‘C’ (‘url-cookie-list’). For details about
the Cookie handling (url)Cookies.
The header line of the EWW buffer can be changed by customizing
‘eww-header-line-format’. The format replaces ‘%t’ with the title of
the website and ‘%u’ with the URL.
The ‘D’ command (‘eww-toggle-paragraph-direction’) toggles the
paragraphs direction between left-to-right and right-to-left text. This
can be useful on web pages that display right-to-left test (like Arabic
and Hebrew), but where the web pages don’t explicitly state the
directionality.
Loading random images from the web can be problematic due to their
size or content. By customizing ‘shr-max-image-proportion’ you can set
the maximal image proportion in relation to the window they are
displayed in. E.g., 0.7 means an image is allowed to take up 70% of the
width and height. If Emacs supports image scaling (ImageMagick support
required) then larger images are scaled down. You can block specific
images completely by customizing ‘shr-blocked-images’.
EWW (or rather its HTML renderer ‘shr’) uses the colors declared in
the HTML page, but adjusts them if needed to keep a certain minimum
contrast. If that is still too low for you, you can customize the
variables ‘shr-color-visible-distance-min’ and
‘shr-color-visible-luminance-min’ to get a better contrast.
In addition to maintaining the history at run-time, EWW will also
save the partial state of its buffers (the URIs and the titles of the
pages visited) in the desktop file if one is used. (emacs)Saving
Emacs Sessions.
EWW history may sensibly contain multiple entries for the same page
URI. At run-time, these entries may still have different associated
point positions or the actual Web page contents. The latter, however,
tend to be overly large to preserve in the desktop file, so they get
omitted, thus rendering the respective entries entirely equivalent. By
default, such duplicate entries are not saved. Setting
‘eww-desktop-remove-duplicates’ to nil will force EWW to save them
anyway.
Restoring EWW buffers’ contents may prove to take too long to finish.
When the ‘eww-restore-desktop’ variable is set to ‘nil’ (the default),
EWW will not try to reload the last visited Web page when the buffer is
restored from the desktop file, thus allowing for faster Emacs start-up
times. When set to ‘t’, restoring the buffers will also initiate the
reloading of such pages.
The EWW buffer restored from the desktop file but not yet reloaded
will contain a prompt, as specified by the ‘eww-restore-reload-prompt’
variable. The value of this variable will be passed through
‘substitute-command-keys’ upon each use, thus allowing for the use of
the usual substitutions, such as ‘\[eww-reload]’ for the current key
binding of the ‘eww-reload’ command.
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eww: History and Acknowledgments