Manipulation: Don't remove HTML comments from scripts #4906
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When evaluating scripts, jQuery strips out the possible wrapping HTML comment and a CDATA section. However, all supported browsers are already doing that when loading JS via appending a script tag to the DOM which is how we've been doing `jQuery.globalEval` since jQuery 3.0.0. jQuery logic was imperfect, e.g. it just stripped the `<!--` and `-->` markers, respectively at the beginning or the end of the script contents. However, browsers are also stripping everything following those markers in the same line, treating them as single-line comments delimiters; this is now also mandated by ECMAScript 2015 in Annex B. Instead of fixing the jQuery logic, just let the browser do its thing. We also used to strip CDATA sections. However, this shouldn't be needed as in XML documents they're already not visible when inspecting element contents and in HTML documents they have no meaning. We've preserved that behavior for backwards compatibility in 3.x but we're removing it for 4.0. Fixes jquerygh-4904
This was referenced Jul 15, 2021
gibson042
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Jul 19, 2021
timmywil
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mgol
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When evaluating scripts, jQuery strips out the possible wrapping HTML comment and a CDATA section. However, all supported browsers are already doing that when loading JS via appending a script tag to the DOM which is how we've been doing `jQuery.globalEval` since jQuery 3.0.0. jQuery logic was imperfect, e.g. it just stripped the `<!--` and `-->` markers, respectively at the beginning or the end of the script contents. However, browsers are also stripping everything following those markers in the same line, treating them as single-line comments delimiters; this is now also mandated by ECMAScript 2015 in Annex B. Instead of fixing the jQuery logic, just let the browser do its thing. We still need to strip CDATA sections for backwards compatibility. This shouldn't be needed as in XML documents they're already not visible when inspecting element contents and in HTML documents they have no meaning but we're preserving that logic for backwards compatibility. This will be removed completely in 4.0. Fixes gh-4904 Closes gh-4905 Ref gh-4906
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Summary
When evaluating scripts, jQuery strips out the possible wrapping HTML comment
and a CDATA section. However, all supported browsers are already doing that
when loading JS via appending a script tag to the DOM which is how we've been
doing
jQuery.globalEvalsince jQuery 3.0.0. jQuery logic was imperfect, e.g.it just stripped the
<!--and-->markers, respectively at the beginning orthe end of the script contents. However, browsers are also stripping everything
following those markers in the same line, treating them as single-line comments
delimiters; this is now also mandated by ECMAScript 2015 in Annex B. Instead
of fixing the jQuery logic, just let the browser do its thing.
We also used to strip CDATA sections. However, this shouldn't be needed as in
XML documents they're already not visible when inspecting element contents and
in HTML documents they have no meaning. We've preserved that behavior for
backwards compatibility in 3.x but we're removing it for 4.0.
Fixes gh-4904
-44 bytes
3.x version of this PR: #4905
Checklist